roughglass bug?

[paulo_gomes]

hi all, i'm having some trouble with the roughglass material. When i apply a texture to the roughness it doesn't work very well (apears a black ball inside my mesh ). here's an image. can anybody please share some light?

used latest cvs build and luxblend exporter (also from cvs).

other tests... (textures don't work with subtrate and plastic)

and a request where's the log from the meeting?

[Radiance]

have you tried inverting your texture you use ?

radiance

[paulo_gomes]

hi radiance, the texture is working fine, the only problem is the 'black ball' inside. i've tested with and without texture and the roughglass always renders black inside. can anybody test? it's a simple uvsphere, maybe is my build.

[Abel]

I've done some tests with a similar setup and got very similar results. It seems that the roughglass material shows a black ball inside when roughness is set to 0.


From left to right:
-roughglass with roughness 0
-roughglass with roughness defined by bitmap (quite contrasty; mostly black and white)
-roughglass with roughness 1

I've attached the scene files:

roughglassmapping.zip

(277.48 KiB) Downloaded 21 times

[Lord Crc]

Roughness parameter should be a positive number (ie > 0). If you want to use a texture for the roughness, make sure that the texture will never evaluate to zero. When using an image, either make sure there are no completely black pixels in it, or use the "mix" texture along with a constant texture (use 1 as constant texture and mix with amount of say 1e-9 or something).

edit: perhaps we should add some code that would clamp the roughness it to a very small value if it is zero? This way images can be used as textures without any hassle.

[paulo_gomes]

ok, did some more testing. a sphere with no texture, only roughness set to 0.01 and the black ball still inside.
here's the material settings:

Code: Select all

   # Material 'vidro'
Texture "vidro--Kr" "color" "constant" "color value" [0.900000 0.900000 0.900000]
Texture "vidro--Kt" "color" "constant" "color value" [0.900000 0.900000 0.900000]
Texture "vidro--uroughness" "float" "constant" "float value" [0.010000]
Texture "vidro--vroughness" "float" "constant" "float value" [0.010000]
Texture "vidro--index" "float" "constant" "float value" [1.500000]
Texture "vidro--cauchyb" "float" "constant" "float value" [0.000000]
Texture "vidro--bumpmap" "float" "constant" "float value" [0.000000]