Spherical environment mapping formula
Author
Anybody knows a formula for calculating texture coordinates for spherical environment mapping? SDK gives one, but it doesn't seem to work very well to me.
Try this:
D3DXMATRIX matRes = matWorld * matView;for( int i = 0; i < NumVertices; i++ ){ D3DXVECTOR3 N ( pvVertices.nx , pvVertices.ny , pvVertices.nz ); // Checking for back faces if( N.x*matRes._13 + N.y*matRes._23 + N.z*matRes._33 > 0.0f ) continue; // Assign the spheremap's texture coordinates pvVertices.tu = ( 1.0f + ( N.x*matRes._11 + N.y*matRes._21 + N.z*matRes._31 ) ) * 0.5f; pvVertices.tv = ( 1.0f - ( N.x*matRes._12 + N.y*matRes._22 + N.z*matRes._32 ) ) * 0.5f;}
Author
Hmm.... Thank you, it works very well on large polygons, but on small ones reflection seems to be random and the environment map can not be recognized. May the polygon's size be a problem?
Author
Yeah, I have... It looks so great on large polygons... But I need it on small ones (((
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