[feynman]

Hi,

from whichever manufacturer I get IES or EULUMDAT data, the Maxwell Fire window renders, but the viewport rendering and the production rendering show quirky black jaggy bars. Has anyone seen this before and knows from whence this occurs? I am using version 2.7.20.0 under Windows 7 Enterprise.

Thanks!

Viewport rendering bug - but Fire is ok! (very odd...)


Production rendering bug

[Mihai]

I think this has more to do with your material than the IES file.

[feynman]

I think this has more to do with your material than the IES file.

Thanks for coming back on this.

I assigned the "frosted_glass.mxm" (03.06.2011 20:13:28) that comes with MR. Is that no good? I have 3 mm thick Schott DURAN laboratory glass to mimick. It is sandblasted on the outside, and the inside (and bottom and top rims) are not. The glass shape does not intersect with other geometry. There is no light in the scene file, apart from an HDR image and an LED (10 mm sphere, EULUMDAT emitter material, sphere hidden from camera).

What is odd though is that FIRE does render the "frosted_glass.mxm" without the artifacts. When I assign, for example, "Industrial Glass" (from the THINK download site, clear glass with no sandblasting effect or else on it), the black jaggy artifacts do not appear.

Should the "frosted_glass.mxm" no longer be used? Should, for example, a sandblasted version be better derived from the "Industrial Glass" material (adding higher roughness? A bump map? Different attenuation?) that mimicks clear non-sandblasted Schott DURAN laboratory glass rather well?

[JDHill]

I think he likely means it would be due to material-related a bug (e.g. see here), in which case you can't really put it in terms of using, or not using, one material or another, since it would instead arise from some particular combination of values (the material system being generic). It looks like something ends up going out of range, and I think I recall seeing a similar pattern once, where it was apparently due to a certain combination of SSS and roughness values. It would probably be best if you could please upload the scene for examination.

[feynman]

I think he likely means it would be due to material-related a bug (e.g. see here), in which case you can't really put it in terms of using, or not using, one material or another, since it would instead arise from some particular combination of values (the material system being generic). It looks like something ends up going out of range, and I think I recall seeing a similar pattern once, where it was apparently due to a certain combination of SSS and roughness values. It would probably be best if you could please upload the scene for examination.

Thanks, JD; great find! Yes, that looks just like the black artifacts I am getting. I've put the data in a Dropbox folder "For JD Hill" here https://www.dropbox.com/sh/zq7kunve5jlzjke/5QMVx1c7nr

In reality, the light's glass (standard sandblasted/etched on the outside, not on the inside) looks like this, when illuminated http://www.atelje-lyktan.se/plug-lamp-bord

If one assigns the default material to all objects, the black artifacts occur also. Similarly, if one assigns the "Industrial Glass" material to the glass part. However, if one does a FIRE and then renders the viewport, occasionally then the viewport rendering shows no black artifacts. Once, however, the camera has been moved, the black artifact reemerge, so one has to fire up FIRE once again. That's very strange behaviour. If the IES sphere with the emitter material is checked to invisible in the object lister, every viewport render and production render works. Therefore, I suspect that the IES emitter material is the culprit, no matter from which manufacturer the EULUMDAT file used is downloaded.

Both "frosted_glass.mxm" and "Industrial Glass" have no additive layers, etc. by the way.

[JDHill]

Thanks for the files, I was able to narrow it down to being due to some combination of this particular IES file (well, LDT), and the position of the light. Here is a modified version of the scene, if you would not mind confirming a) that you see the effect occurring upon opening and rendering this file, and b) that you do not see it when swapping in some other IES files (and perhaps you have yet others that do trigger it, which would be interesting as well). Basically, I have removed all of your geometry, to rule that variable out, and replaced it with a couple of planes and a sphere, from the standard Maxwell object library. The modified scene also no longer uses IBL, and only contains a default material, and an IES material, both of which were created from scratch.

The behavior I expect is that upon opening and hitting Render (in Maxwell, not FIRE), you should observe this black bar issue. Next, drag the IES sphere around a bit, such that the lobe is no longer intersecting the planes; by doing this, I am able to prevent the issue, though I can't say precisely, since I did observe it both when there was intersection, and when there was not. I then tried to reproduce it using several of the Maxwell-supplied IES files, and was not able to do so, though I did not check them all (and keeping in mind that it seems to be pretty touchy, so I may just not have put the emitter in a location where the behavior would manifest).

Not sure if/how this will really be helpful to you, but regardless, thanks again for uploading the files.

[feynman]

Hi JD,

thanks for looking at it, much appreciated!

1. If I open your file and click render viewport first thing, the viewport renders without black artifacts. If I then scale and/or move the IES sphere about the scenery, intersecting geometry or not, the viewport always renders without black artifacts.

2. If I load an HDR image for lighting, the IES sphere not in front of the HDR image in the background, the viewport renders without black artifacts.

3. If I then move the camera so the IES sphere is in front of the HDR image background, I get black artifacts.

4. If I then remove the HDR image background, the black artifacts remain.

5. If I then do a FIRE rendering, the next viewport rendering render has no black artifacts. The one after does. The one after too. The one after not.

6. If I set Environment Type to None, the viewport renders completely black, FIRE renders ok (as it always does). All viewport renders remain 100% black.

7. If I use a two year old IES or EULUMDAT file, the viewport rendering is ok in your scene. Opening an old and new IES/EULUMDAT file side by side, I cannot see the difference; the lines and data-structure seem to be the same. In DIALux (light planner software, any EULUMDAT file works, no matter how old or from whatever manufacturer like Osram, Philips, Sharp, Citizen, etc.)

This rendering behaviour does not make sense to me at all, there seems no clear pattern (other than that the "old" IES file works) : (

Is IES lighting broken in the current version, because there has been a new IES and EULUMDAT data-structure been introduced?

I put an "old" and a "new" IES file in the same dropbox folder where you picked up the scene file, so maybe your trained eye can spot the difference in the data-structure that somehow makes MR behave the way it does?

[JDHill]

I can't really make any such blanket statements (i.e. IES is/isn't "broken") based on this, I can only tell you what I observe. You uploaded three additional files, all IES; two of them appear to work all the time:

• ies00028-00_CL-L103-C6N.ies
  ies00031-00_CL-L103-C3N-C.ies

However, use of the third (ies0072-00_CLL030-1206A1-303M1A2_IES_32K.ies) results in Maxwell returning a "Can't read photometric file" error message. In Explorer, I see that the thumbnail plugin also fails to generate a preview for this file (it shows up with a "No Preview" thumbnail), indicating that it is not readable by that instance of the code, either. I assume that this last IES is supposed to be the same light represented by the original ldt0072-00_CLL030-1206A1-303M1A2_Eulumdat_32K.ldt file, which raises a question: were you attempting to use the LDT version because you also received the same error when attempting to use the IES one?

That is the only pattern I see with this set of files: that the IES version of 0072-00_CLL030-1206A1-303M1A2_32K cannot be loaded, and that the LDT version tends to render with artifacts. Would you agree with this, or do you see another factor? I am not necessarily implying that there is something wrong with these two files -- there may or may not be -- I am only saying that from what I see, Maxwell is not getting along with either one.

[feynman]

Thanks, the ...CL-103... files are from two LED lamps released in 2010, the ...CLL030... files are from LED lamps released in 2011. If one opens an "old" file and a "new" file side by side, the "new" file anatomy starts with more bracketed lines "[...]" than the "old" ones and the following blocks of numbers end with more zeros; see differences below.

Why "old" and "new" files work in FIRE and why "FIRING" forces the viewport render to occasionally working renderings is beyond my guess. Maybe you could ask a colleague who programmed the IES/EULUMDAT functionality, what apparently has changed?

"old" ...CL-103... file

IESNA:LM-63-1995
[TEST]
[TESTDATE]15-1-2010 18:08:04
[MANUFAC]
[LAMP]LED
[_NUMBEROFRAYS]10000000
TILT=NONE
1 720.0000 1.00 91 361 1 2 0.007 0.050 0.001
1 1 6.40
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
221.17012 216.50835 214.22975 215.17383 219.29454 217.64348 211.35989 213.21875 216.66035 216.01192 212.94823 211.96790
214.03314 213.78212 206.14870 208.41893 209.52475 207.22105 206.72601 205.78473 205.71780 208.77032 199.09258 202.95113
198.64076 198.30609 194.33459 194.85194 193.32498 189.55009 187.66614 188.89609 190.09811 178.06787 178.95895 183.24979
176.06818 170.32288 171.37013 166.64282 165.19116 163.57494 163.83850 157.47963 155.55942 152.00906 150.64525 148.12820
146.62912 144.56946 138.66380 133.12769 129.37511 125.74943 120.39320 115.34795 117.42015 116.79542 113.40263 107.82049
101.77260 95.67171 94.68580 88.68253 83.67910 84.68174 77.49873 71.85104 70.78008 67.92277 64.86884 59.29088 55.52018
48.91449 42.82197 42.00480 38.70125 32.97688 29.71238 23.87365 20.42229 17.05181 14.34232 11.57426 8.83548 5.98375 4.20996
2.67742 1.22436 0.00000 0.00000

"new" ...CLL030...file

IESNA:LM-63-2002
[TEST]1
[TESTLAB]Radiant Imaging ProSource
[ISSUEDATE]2011/10/31 10:31:00
[TESTDATE]27-9-2011 10:50:58
[MANUFAC]Citizen Electronics CO.,LTD.
[LAMP]LED
[_NUMBEROFRAYS]10000000
TILT=NONE
1 1048.5341 1.00 94 361 1 2 0.019 0.019 0.001
1 1 10.02
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
363.34802 367.97562 369.07068 368.66403 366.63315 363.56848 367.25540 366.84872 362.24316 362.78458 366.00845 364.41119
362.88989 360.29068 357.29950 356.45435 352.03741 349.03397 350.92029 352.64737 349.36469 342.25055 340.52591 340.24417
335.04086 328.60040 327.72339 327.16974 325.02374 321.04529 315.38144 313.37015 311.09433 303.66415 301.40302 301.90768
295.16345 289.84744 288.31387 282.93173 275.73672 275.73184 273.31635 264.19830 258.18655 253.42419 248.71819 244.90388
237.63541 232.74567 228.26749 223.05925 219.28169 214.52179 208.55905 200.78346 195.32292 190.40868 184.15685 180.04613
172.05742 164.85999 159.10791 152.78749 146.00162 140.94283 134.87230 128.29465 124.35786 116.90565 107.91744 100.54606
93.42947 88.59607 82.18501 74.67890 69.19141 61.13900 52.71423 46.30317 42.01607 36.82745 29.80640 23.75056 18.82161
14.53451 11.29836 8.64280 6.16935 4.75256 0.00000 0.00000 0.00000 0.00000

[feynman]

Thanks, the ...CL-103... files are from two LED lamps released in 2010, the ...CLL030... files are from LED lamps released in 2011. If one opens an "old" file and a "new" file side by side, the "new" file anatomy starts with more bracketed lines "[...]" than the "old" ones and the following blocks of numbers end with more zeros; see differences below.

Why "old" and "new" files work in FIRE and why "FIRING" forces the viewport render to occasionally working renderings is beyond my guess. Maybe you could ask a colleague who programmed the IES/EULUMDAT functionality, what apparently has changed and could cause the black artifacts as well as the "in-FIRE-it-renders-ok-and-then-sometimes-in-the-viewport" issue?

Further links http://docs.agi32.com/PhotometricToolbo ... format.htm or http://www.kxcad.net/autodesk/3ds_max/A ... ormat.html

"old" ...CL-103... file

IESNA:LM-63-1995
[TEST]
[TESTDATE]15-1-2010 18:08:04
[MANUFAC]
[LAMP]LED
[_NUMBEROFRAYS]10000000
TILT=NONE
1 720.0000 1.00 91 361 1 2 0.007 0.050 0.001
1 1 6.40
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
221.17012 216.50835 214.22975 215.17383 219.29454 217.64348 211.35989 213.21875 216.66035 216.01192 212.94823 211.96790
214.03314 213.78212 206.14870 208.41893 209.52475 207.22105 206.72601 205.78473 205.71780 208.77032 199.09258 202.95113
198.64076 198.30609 194.33459 194.85194 193.32498 189.55009 187.66614 188.89609 190.09811 178.06787 178.95895 183.24979
176.06818 170.32288 171.37013 166.64282 165.19116 163.57494 163.83850 157.47963 155.55942 152.00906 150.64525 148.12820
146.62912 144.56946 138.66380 133.12769 129.37511 125.74943 120.39320 115.34795 117.42015 116.79542 113.40263 107.82049
101.77260 95.67171 94.68580 88.68253 83.67910 84.68174 77.49873 71.85104 70.78008 67.92277 64.86884 59.29088 55.52018
48.91449 42.82197 42.00480 38.70125 32.97688 29.71238 23.87365 20.42229 17.05181 14.34232 11.57426 8.83548 5.98375 4.20996
2.67742 1.22436 0.00000 0.00000

"new" ...CLL030...file

IESNA:LM-63-2002
[TEST]1
[TESTLAB]Radiant Imaging ProSource
[ISSUEDATE]2011/10/31 10:31:00
[TESTDATE]27-9-2011 10:50:58
[MANUFAC]Citizen Electronics CO.,LTD.
[LAMP]LED
[_NUMBEROFRAYS]10000000
TILT=NONE
1 1048.5341 1.00 94 361 1 2 0.019 0.019 0.001
1 1 10.02
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84
85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304
305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335
336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360
363.34802 367.97562 369.07068 368.66403 366.63315 363.56848 367.25540 366.84872 362.24316 362.78458 366.00845 364.41119
362.88989 360.29068 357.29950 356.45435 352.03741 349.03397 350.92029 352.64737 349.36469 342.25055 340.52591 340.24417
335.04086 328.60040 327.72339 327.16974 325.02374 321.04529 315.38144 313.37015 311.09433 303.66415 301.40302 301.90768
295.16345 289.84744 288.31387 282.93173 275.73672 275.73184 273.31635 264.19830 258.18655 253.42419 248.71819 244.90388
237.63541 232.74567 228.26749 223.05925 219.28169 214.52179 208.55905 200.78346 195.32292 190.40868 184.15685 180.04613
172.05742 164.85999 159.10791 152.78749 146.00162 140.94283 134.87230 128.29465 124.35786 116.90565 107.91744 100.54606
93.42947 88.59607 82.18501 74.67890 69.19141 61.13900 52.71423 46.30317 42.01607 36.82745 29.80640 23.75056 18.82161
14.53451 11.29836 8.64280 6.16935 4.75256 0.00000 0.00000 0.00000 0.00000

[JDHill]

Yes, we'll take a look. Could you please remark on this point, though?

However, use of the third (ies0072-00_CLL030-1206A1-303M1A2_IES_32K.ies) results in Maxwell returning a "Can't read photometric file" error message. [...] I assume that this last IES is supposed to be the same light represented by the original ldt0072-00_CLL030-1206A1-303M1A2_Eulumdat_32K.ldt file, which raises a question: were you attempting to use the LDT version because you also received the same error when attempting to use the IES one?

I need to be sure that this read-failure is not due to the file being different here on my machine, than it is there, on yours.

[feynman]

Yes, we'll take a look. Could you please remark on this point, though?

However, use of the third (ies0072-00_CLL030-1206A1-303M1A2_IES_32K.ies) results in Maxwell returning a "Can't read photometric file" error message. [...] I assume that this last IES is supposed to be the same light represented by the original ldt0072-00_CLL030-1206A1-303M1A2_Eulumdat_32K.ldt file, which raises a question: were you attempting to use the LDT version because you also received the same error when attempting to use the IES one?

I need to be sure that this read-failure is not due to the file being different here on my machine, than it is there, on yours.

I downloaded the files from the manufacturer's website http://ce.citizen.co.jp/lighting_led/en ... index.html once again, just to be sure, put them in the For JD Hill Dropbox folder, and then used them in the MXS provided as before:

The file ies00028-00_CL-L103-C6N.ies results in no error in MR reading the file/material preview rendering with no coloured artifacts/FIRE rendering ok/viewport rendering ok
The file ies00031-00_CL-L103-C3N-C results in no error in MR reading the file/material preview rendering with no coloured artifacts/FIRE rendering ok/viewport rendering ok

The file ies0072-00_CLL030-1206A1-303M1A2_IES_32K results in no error in MR reading the file/material preview rendering with no coloured artifacts/FIRE rendering ok/viewport rendering black artifacts/blue IES dots displayed erraticly see image in Dropbox
The file ldt0072-00_CLL030-1206A1-303M1A2_Eulumdat_32K results in no error in MR reading the file/material preview rendering with no coloured artifacts/FIRE rendering ok/viewport rendering black artifacts/viewport rendering ok when a FIRE rendering has been invoked and the FIRE window is open/viewport rendering black artifacts when camera is moved, but occasionally no black artifacts

In the latter two cases, when I switch IBL to None, the viewport is 100% black, whereas the FIRE preview renders the emitter.

So, yes, because the ies0072-00_CLL030-1206A1-303M1A2_IES_32K file results in black artifacts as well as an erratic IES dots display in the viewport, I then used the EULUMDAT file of the same lamp, hoping that would work better.

[JDHill]

Thanks, one more thing then, could you please zip those IES/LDT files -- not the ones on your dropbox, unless you're referencing them from there, but the actual files you're using, where they are actually located on your disk? Reason being: the fact that I see a "Can't read photometric file" dialog here, and you don't there (you say above that you see black artifacts & erratic IES representation in the viewport), implies that the file is being altered in some way as I download it. Zipping (I prefer 7z, which I guess you have, since I used it above) will rule out that possibility.

[feynman]

Thanks, one more thing then, could you please zip those IES/LDT files -- not the ones on your dropbox, unless you're referencing them from there, but the actual files you're using, where they are actually located on your disk? Reason being: the fact that I see a "Can't read photometric file" dialog here, and you don't there (you say above that you see black artifacts & erratic IES representation in the viewport), implies that the file is being altered in some way as I download it. Zipping (I prefer 7z, which I guess you have, since I used it above) will rule out that possibility.

The original downloads (the IES and the EULUMDAT files that could be faulty or to a new file-format standard), as zipped by the manufacturer, are still in the For JD Hill folder

CLL030-1206A1_3000K_Ref.CE-P1675_1111_LDT.zip
CLL030-1206A1_3000K_Ref.CE-P1676_1111_IES.zip

which I unpacked in the For JD Hill folder.

ps: just a suggestion - wouldn't it be useful (and good marketing) for Next Limit to collaborate with the big lamp manufacturers like http://www.lighting.philips.com/main/co ... nloads.wpd and, not via a plug in, but via download make IES/EULUMDAT files available? After all, the lamps provided in MR's library are, well, superseded by newer FLs, CFLs and LEDs?

[JDHill]

Thanks, I'll see if it works differently with the zipped versions. Regarding the IES files included with Maxwell, those are just put in for example, as with the small number of included HDRIs, etc.