[Thomas An.]

Thomas, does it matter about the location and time of day?

Shouldn't matter, as long as you place a 90mm disc 10 meters away from the camera and it looks as big as the sun.

The sun "looks" bigger to our eyes because either our brain magnifies it or we are used to photos taken with telephoto lenses (magnifying everything including the sun)

[tom]

Thomas, the sun radius multiplier of 1x should give the same sun in the previous versions. Do you mean Maxwell might have a problem with this radius not physically matching the real sun?

[eric nixon]

Yes 1 is the same as before, but IF that website is correct about the 0.533 degrees then that = 1.9 radius,

I didnt test what 12noon looked like from ecuador... just the default sky.

[Thomas An.]

Thomas, the sun radius multiplier of 1x should give the same sun in the previous versions. Do you mean Maxwell might have a problem with this radius not physically matching the real sun?

I have never tested the sun radius in the past. It is possible it was too small all along.
If Eric did the disk-test right, then it seems 1.9 (or say 2) is the correct radius that should be used as default (I don't have v3 to test personally and don't have v2 or Rhino set up on this new machine).

[JDHill]

Looks pretty close to me, using actual size & distance (& default sun radius factor of 1.0):

• 

[Thomas An.]

Looks pretty close to me, using actual size & distance (& default sun radius factor of 1.0):

So, 1x was correct then. Possibly Eric used a 90mm radius (as opposed to diameter) during construction.

[JDHill]

And just for the sake of completeness (quoted distances are from earth surface to moon center):

• 

Which matches up pretty nicely with this:

• 

[seghier]

where and when the radius of sun change ? can maxwell calculate it automaticly ?
the sharpness of shadow can change at the same time in the same place according to the air condition so we need control the radius or studio need "air condition" option

[rusteberg]

where and when the radius of sun change ? can maxwell calculate it automaticly ?
the sharpness of shadow can change at the same time in the same place according to the air condition so we need control the radius or studio need "air condition" option

you obviously haven't tried the latest and greatest smokin' hot beta have you?

[seghier]

where and when the radius of sun change ? can maxwell calculate it automaticly ?
the sharpness of shadow can change at the same time in the same place according to the air condition so we need control the radius or studio need "air condition" option

you obviously haven't tried the latest and greatest smokin' hot beta have you?

you mean version 3.0.0.4 ?

[rusteberg]

you mean version 3.0.0.4 ?

no, you must be thinking of this one. it had the old air condition option

[seghier]

you mean version 3.0.0.4 ?

no, you must be thinking of this one. it had the old air condition option

i don't know the good term in english i use google translate
" l'état du climat" en français

[eric nixon]

Possibly Eric used a 90mm radius (as opposed to diameter) during construction

yes what a silly mistake, sorry.