It sounds like eye linear tex gen is broken for some reason. I'd contact NVidia about this problem, lots of other people must be being hit by it too. The spec is pretty clear about how eye linear and object linear texgen should work, its pretty sloppy of them to break this.
Robert.
On 8/27/06, Botorabi <[EMAIL PROTECTED]> wrote:
hi,
i could fix the problem with eye-space transformation. i multiply the tex gen matrix by camera's inverse modelview matrix in every frame, now the shadows work also for transformed nodes. to be honest, i don't know why this multiplication is needed!? it seems that in older nvidia drivers the built-in eye linear planes were already multiplied with that inverse matrix before they were passed to the vertex shader.
cheers
boto
boto wrote:
###########
hi,
unfortunately, it seems that the nvidia driver has another bug, the built-in uniform gl_ModelViewMatrix it is. see the code below: the vertex position is transformed to eye-space by multiplying gl_Vertex with gl_ModelViewMatrix. however that results in wrong shadows, actually no shadows on VRC island -- i have replaced the eye planes by the matrix 'texgenMatrix' which i pass through the _MVPT uniform (for the code see the link in my last posting). if i do not transform the vertices via gl_ModelViewMatrix then only meshes with no transformation get proper shadows, i.e. the player and other meshes which do not origin at 0,0,0 get wrong or no shadows :-(
what the hell happened to nvidia? i wonder how it could happen that the ogl support got broken so radically!?
further help to work-around the new bug would be great.
cheers
boto
"/* \n"
"* Vertex shader for shadow mapping \n"
"* http://yag2002.sf.net \n"
"* 06/27/2006 \n"
"*/ \n"
"uniform mat4 texgenMatrix; \n"
"varying vec4 diffuse, ambient; \n"
"varying vec3 normal, lightDir, halfVector; \n"
"varying vec2 baseTexCoords; \n"
"const int shadowTexChannel = 1; \n"
" \n"
"void main() \n"
"{ \n"
" normal = normalize( gl_NormalMatrix * gl_Normal ); \n"
" lightDir = normalize( vec3( gl_LightSource[ 0 ].position ) ); \n"
" halfVector = normalize( gl_LightSource[ 0 ].halfVector.xyz ); \n"
" diffuse = gl_FrontMaterial.diffuse * gl_LightSource[ 0 ].diffuse; \n"
" ambient = gl_FrontMaterial.ambient * gl_LightSource[ 0 ].ambient; \n"
" ambient += gl_LightModel.ambient * gl_FrontMaterial.ambient; \n"
" \n"
" vec4 pos = gl_ModelViewMatrix * gl_Vertex; \n"
" gl_TexCoord[ shadowTexChannel ] = texgenMatrix * pos; \n"
" gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; \n"
" baseTexCoords = gl_MultiTexCoord0.st; \n"
"} \n"
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