posted 05-06-2002 11:10 AM          

code:

---

textures/anoxq3_rowdy/walker1
{
	qer_editorimage textures/anoxq3tex_rowdy01/walker1.tga
	surfaceparm metalsteps
	surfaceparm alphashadow
	nomipmaps
	{
		map textures/anoxq3tex_rowdy01/walker1.tga
		alphaFunc GT0
		depthWrite
	}
	{
		map $lightmap
		rgbGen identity
		blendFunc GL_DST_COLOR GL_ZERO
		depthFunc equal
	}
}

---

Now when I normally compile the lightmaps (without radiosity) with ydnar q3map 2.00 -RC6 with "q3map.exe -light -fast -super 2 -patchshadows -v" I don't see any shadows from that shader at all.

So I have made a little test box map. The shader does indeed not cast shadows, but when I do radiosity passes, it seems to process the alpha channel on those passes. See this image:

That screenshot was done with r_lightmap 1. If you look closely you can see some stripes of shadows on the walls which seem to be coming from the grate.

The left grate is a regular detail brush completely covered in the above shader.
The right grate is a patch.
The exact commandline passed to q3map is "-light -fast -super 2 -patchshadows -bounce 8 -bouncegrid -v", however q3map quits after the 5th radiosity pass because of lack of diffuse lights to calculate.

I have set _lightmapscale .001 in the worldspawn, so even small artifacts should be visible.

posted 05-08-2002 06:46 AM          

I could see the shadows with a field of pointlights above the shader each with an intensity of 1:

I'm not really satisfied with that so I made a qer_editorimage with an alpha channel with 127 127 127 so it lets half the light pass through over the whole surface.

That seems half way Ok to me.

posted 05-08-2002 11:33 AM           

interesting thread BTW.

------------------

-QkennyQ

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posted 05-09-2002 05:56 AM          

This is with the lights farther away:

I think it has to do with the parallelity of the light. The farther away it is, the more parallel are the rays.

This is with sky light (which is be parallel AFAIK):

The shadows are even clearer and sharper.

It's like this I think:

The light rays (or volumes?) "overlap" behind the grate if they are non-parallel. That means that the higher the lights intensity the more they whiten out the shadows.
The farther away the light, the more parallel the rays and therefore the shadows become sharper.