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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