Hi all,
I am using 1.8
I need a displacement mapping for a square lattice, with 128x128 512x512 ...
vertices for example
I have a new map for every frame
I looked at shaders today for the first time, I love them!! :D
..but I realy don't get how to pass the textures to the shader :(
first the shader :
string dcShader::disp_vp_program =
"uniform sampler2D displacementMap;"
"\n"
"void main(void) {"
" vec4 newPos;\n"
" vec4 dv;\n"
" float df;\n"
" vec2 texture_coordinate;\n"
" gl_TexCoord[0].xy = gl_MultiTexCoord0.xy;\n"
" dv = texture2D(displacementMap, gl_TexCoord[0].xy);\n"//---here is the
problem!
//" dv = vec4(10.0 , 10.0, 10.0 ,0.0);\n"//---this works!
" df = dv.x + dv.y + dv.z;\n"
" newPos = vec4(gl_Normal * df, 0.0) + gl_Vertex;\n"
" gl_Position = gl_ModelViewProjectionMatrix * newPos;"
"}";
string dcShader::disp_fp_program =
"vec4 fvAmbient = vec4(0.5, 0.5, 1.0, 1.0);\n"
"\n"
"void main(void)"
"{"
" gl_FragColor = fvAmbient;"
"}";
SHLChunkPtr shl = SHLChunk::create();
beginEditCP(shl);
shl->setVertexProgram(disp_vp_program);
shl->setFragmentProgram(disp_fp_program);
endEditCP(shl);
//my material
UChar8* data = new UChar8[rN*cN*4];
for(int i=0;i<rN*cN*4;i++) data[i] = 1;
ImagePtr img = Image::create();
beginEditCP(img);
img->set( Image::OSG_RGBA_PF, cN, rN, 1, 1, 1, 0, data,
Image::OSG_FLOAT32_IMAGEDATA);
endEditCP(img);
SimpleTexturedMaterialPtr Mat =
SimpleTexturedMaterial::create();
beginEditCP(Mat);
Mat->setDiffuse(Color3f(0.8,0.8,0.6));
Mat->setAmbient(Color3f(0.4, 0.4, 0.2));
beginEditCP(Mat);
Mat->addChunk(shl);
endEditCP(Mat);
Mat->setImage(img);
Mat->setMinFilter(GL_NEAREST);
Mat->setMagFilter(GL_NEAREST);
Mat->setEnvMode(GL_NONE);
endEditCP(Mat);
the problem :
no displacement when I use the texture data and the application becomes
realy slow, but it works perfectly with any other values like the vertex
position etc..
my problem is also that I have no clue how to debug a shader.. is there any
way for console output?
and even if I could know the values from the texture in the shader.. if they
are wrong I don't know what to do.. I have no clue how the texture is
supposed to get to the shader :/
thanks for reading!
Best Regards,
Victor
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