Re: [osg-users] Self-Shadowing of Billboards

[Sergey Polischuk]

Hi

 

shadow2DProj(sampler, tc.xyzw)  returns float result of shadow comparision test (so it is eccentially 0 or 1) between value stored in texture and tc.z/tc.w, it may be filtered across 2x2 tap (PCF) if texture filter set to linear and such filtering supported by hardware (obviously, with this filtering you'll get more different values).

if you need raw depth value use texture2DProj(sampler, ...)

 

Cheers.

22.08.2012, 16:29, "Daniel Schmid" <daniel.sch...@swiss-simtec.ch>:

Hi all

 

I’m thinking of a solution to prevent self shadowing for billboards:

 

If I can determine the radius of the billboard, and verify that the surface that casts shadow on the billboard is further away that the radius, I could make sure that all objects can cast shadows on the billboard, but not the billboard itself…

Does anybody have an idea how this could look in GLSL? What is the actual return value given back by shadow2DProj? Is it the distance from the

 

I use VDSM as a shadow technique (derived from actually), and I build my shadow receiving shader with the ShaderGenerator class.

 

Regards

Daniel

 

 

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