Rendering thick glass and light question
I'm just getting over the learning curve in Cheetah - much thanks to Luke's sunset tutorial for helping me "get it".
I'm trying to model the attached lighting fixture - sphere.pdf It's a cast glass fixture, very thick with a small filament bulb inside.
I've attached a small rendering of three lights. They all have in common point sources with 0.1 intensity, ray trace with transparency, and clamp attenuation off, the glass has a refraction index of 1.5:
The differences are as follow:
-The Left one has no geometry, no attenuation but you can't see the glowing filament.
-The middle one has geometry, attenuation 1/(r^2), problem: a black sphere suddenly appears
-The right one has no geometry, attenuation 1/(r^2), problem: the fixture disappears
I have a number of questions, all leading to: How do you rendering this thick glass lighting fixture? The attached close-up shows the left light with glass that looks as thin as a wine glass. And what's wrong with my lighting settings to show the glowing filament (not intending to model the filament, just a small spot of light)
The model was made in Sketchup with the follow-me tool. I'm just quicker with SU and haven't used C3d for making the shapes - maybe that's the problem.
Any help would be appreciated.
I'm just getting over the learning curve in Cheetah - much thanks to Luke's sunset tutorial for helping me "get it".
I'm trying to model the attached lighting fixture - sphere.pdf It's a cast glass fixture, very thick with a small filament bulb inside.
I've attached a small rendering of three lights. They all have in common point sources with 0.1 intensity, ray trace with transparency, and clamp attenuation off, the glass has a refraction index of 1.5:
The differences are as follow:
-The Left one has no geometry, no attenuation but you can't see the glowing filament.
-The middle one has geometry, attenuation 1/(r^2), problem: a black sphere suddenly appears
-The right one has no geometry, attenuation 1/(r^2), problem: the fixture disappears
I have a number of questions, all leading to: How do you rendering this thick glass lighting fixture? The attached close-up shows the left light with glass that looks as thin as a wine glass. And what's wrong with my lighting settings to show the glowing filament (not intending to model the filament, just a small spot of light)
The model was made in Sketchup with the follow-me tool. I'm just quicker with SU and haven't used C3d for making the shapes - maybe that's the problem.
Any help would be appreciated.