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- DotProd = -DirX*NormX -DirY*NormY -DirZ*NormZ
- IF DotProd < 0
- NormX = -NormX
- NormY = -NormY
- NormZ = -NormZ
- DotProd = -DirX*NormX - DirY*NormY - DirZ*NormZ
- ENDIF
- DirX = DirX + NormX*DotProd*2
- DirY = DirY + NormY*DotProd*2
- DirZ = DirZ + NormZ*DotProd*2
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