[Tim Ellis]

Not getting anywhere with obstruction maps. I can't seem to see a difference between using one and not.

I've read and re-read the manual section for this, which doesn't give enough information imho.

Which sliders work with obstruction maps and which affect the effect?

Do I have to use a glare map as well, for the obstruction map to work?

Please can anyone help?

I've tried all sorts of combinations, but only seem to get a result with a glare map loaded too.

Anyone have any example renders with and without an obstacle map for comparison?

Cheers in advance.

Tim.

[-Adrian]

Same for me, i think it might be necessary to have a relatively small and bright lightsource like the sun to see a good effect.

[Mihai]

You need to have a glare map loaded as well yes. The obstacle map should have the inverse colors of the glare map so for example if you have a white hexagonal aperture for the glare map and the rest is black, the obstacle map should all white with some lines, small scratches etc in black.

[Tim Ellis]

You need to have a glare map loaded as well yes. The obstacle map should have the inverse colors of the glare map so for example if you have a white hexagonal aperture for the glare map and the rest is black, the obstacle map should all white with some lines, small scratches etc in black.

Cheers Mihai, that helps. There's no indication in the manual, that you need to have both loaded for the obstruction map to have an effect.

Thanks, I'll try some more tests for comparison.

Tim.

[KurtS]

There's no indication in the manual, that you need to have both loaded for the obstruction map to have an effect.

Looks like the manual needs an update...

[JCAddy]

There's no indication in the manual, that you need to have both loaded for the obstruction map to have an effect.

Looks like the manual needs an update...

Looks like the manuals NEEDED an update

[beatriz]

I know this is old, but the manual says, page 108:

Code: Select all

If you don't want to use an obstacle map, you can leave this path blank, you only need an aperture map for diffraction to work.

As far as I understand you need an aperture map to get diffraction to work.

I'll try to update the manual so it says directly anyway.
Thanks for the feedback.

[Tim Ellis]

I know this is old, but the manual says, page 108:

Code: Select all

If you don't want to use an obstacle map, you can leave this path blank, you only need an aperture map for diffraction to work.

As far as I understand you need an aperture map to get diffraction to work.

I'll try to update the manual so it says directly anyway.
Thanks for the feedback.

True mate, but it doesn't say I have to have both maps loaded for an obstacle map to have an effect. It just says what colour/type of map could be used as an obstacle map.

Mihai's tip is not in the manual either:-

'The obstacle map should have the inverse colors of the glare map so for example if you have a white hexagonal aperture for the glare map and the rest is black, the obstacle map should all white with some lines, small scratches etc in black.'

Are there any plans to be able to use obstacle maps and apature maps, independently of each other?

For example, if I want to use the eyelash obstacle map, but not have any glare.

Cheers,

Tim.

[beatriz]

Let's see what we can do... thanks for the feedback

[tom]

Both of these maps serve the same purpose in order, "blocking the light". Primarily, aperture opening itself is the main obstacle. So, first of all, you need to provide an aperture map. If you provide a full white aperture map, it means you're not using an aperture map. By default, it's how Maxwell renders. So, an obstacle (the thing blocking the light) means any black part on either of these maps. Then you may wonder, why there are two maps? Easy. With aperture maps apart, you can have a set of standard aperture openings as the primary shape blocking the light and with obstacle map you can have additional shapes again blocking the light. Therefore, there are two maps for intuition. Otherwise you had to generate all possibilities of openings as separate images.

[Tim Ellis]

Thanks Tom.


So can I use an obstacle map as a 'mask', for an area of the image to have the apature map affect it?
Where the white areas are not affected and the black areas are?

Cheers,

Tim.

[tom]

No, I've meant this:

[w i l l]

Has anyone got an obstacle map to show an effect on a render yet? I cant see any difference here (i'm using the inverse to the aperture map).

Would be good to see some examples.