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greg |
2.1 |
{ SCCSid "$SunId$ LBL" } |
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{ |
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Interpolate triangle-mesh values using barycentric coordinates. |
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A1 through A12 = Transformation matrix for barycentric system |
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and: |
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A13 through A21 = Surface normal perturbation matrix |
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or: |
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A13 through A18 = Lookup in 2-dimensional pattern or texture |
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} |
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{ Compute barycentric coordinates } |
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a = Px*arg( 1) + Py*arg( 2) + Pz*arg( 3) + arg( 4); |
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b = Px*arg( 5) + Py*arg( 6) + Pz*arg( 7) + arg( 8); |
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c = Px*arg( 9) + Py*arg(10) + Pz*arg(11) + arg(12); |
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{ Compute variables } |
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v1 = a*arg(13) + b*arg(14) + c*arg(15); |
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v2 = a*arg(16) + b*arg(17) + c*arg(18); |
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v3 = a*arg(19) + b*arg(20) + c*arg(21); |
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{ Surface normal perturbation } |
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nf = 1/sqrt(v1*v1 + v2*v2 + v3*v3); |
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dx = v1*nf - Nx; |
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dy = v2*nf - Ny; |
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dz = v3*nf - Nz; |
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{ Lookup table index } |
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u = v1; |
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v = v2; |
