Yes, I dropped everything but the thing I experienced problem with, the
shader replacement of TexGen.
Thanks for the tip to look into StandardShadowMap.cpp, that was the only one
I didnt peek into before.
Now it works.
/Anders
On Mon, Jun 7, 2010 at 11:42 PM, Wojciech Lewandowski <lewandow...@ai.com.pl
> wrote:
> Hi Anders,
>
> I see two problems with your shader.
>
> First it looks like you swaped shadow and jitter map coords. I suppose you
> want to generate shadow map coords with texgen. So texgen should produce
> unit 1 texture coords. But most probably you should use view space
> (gl_EyePlane) coords for shadow coords.
>
> Second it looks like lighting/ color math is completely absent so resulting
> lighting will be probably random.
>
> Please have a look at Vertex shader in osgShadow::StandardShadowMap.cpp.
> Its quite generic and except jitter part it should contain all what you need
> for single light scenario.
>
> Cheers,
> Wojtek Lewandowski
>
>
> *From:* Anders Backman <ande...@cs.umu.se>
> *Sent:* Monday, June 07, 2010 3:27 PM
> *To:* OpenSceneGraph Users <osg-users@lists.openscenegraph.org>
> *Subject:* [osg-users] vertex shader for SoftShadowMap FragmentShader.
>
> Hi all.
>
> Im trying to use a VertexShader to drive the SoftShadowMap implementation
> of the FragmentShader (which is present in the SoftShadowMap.cpp).
>
> Problem is as usual, that when vertex shader is enabled, all automatic
> stuff are disabled, such as texture generation.
> Now after browsing archive, surfing the net and looking through the GLSL
> book, I have come to the conclusion that the vertex shader below should be
> enough to drive the Fragmentshader:
>
> void main( void )
> {
> gl_Position = ftransform();
> gl_TexCoord[0] = gl_MultiTexCoord0;
> gl_TexCoord[1] = gl_MultiTexCoord1;
>
> // Emulate glTexGen (on unit 2)
> gl_TexCoord[2].s = dot(gl_Vertex, gl_ObjectPlaneS[2]);
> gl_TexCoord[2].t = dot(gl_Vertex, gl_ObjectPlaneT[2]);
> gl_TexCoord[2].p = dot(gl_Vertex, gl_ObjectPlaneR[2]);
> gl_TexCoord[2].q = dot(gl_Vertex, gl_ObjectPlaneQ[2]);
>
> }
>
> baseTexture - Texture unit = 0
> osgShadow_shadowTexture - Texture unit = 1
> osgShadow_jitterTexture - Texture unit = 2
>
> But as soon as I enable this vertex shader, the shadow stops working.
> I need to write my own vertex shader to calculate vertex pos in eye
> coordinates etc. Im basically trying to merge the shadows with other
> texturing, such as parallax mapping etc.
>
> Any hints on how to write a vertex shader that will replace the fixed
> functionality for the SoftShadowMap Fragment shader (with base texture)??
>
> /Anders
>
> --
>
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