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-rw-r--r--contrib/Opcode/Ice/IceRay.cpp84
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diff --git a/contrib/Opcode/Ice/IceRay.cpp b/contrib/Opcode/Ice/IceRay.cpp
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-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-/**
- * Contains code for rays.
- * \file IceRay.cpp
- * \author Pierre Terdiman
- * \date April, 4, 2000
- */
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-/**
- * Ray class.
- * A ray is a half-line P(t) = mOrig + mDir * t, with 0 <= t <= +infinity
- * \class Ray
- * \author Pierre Terdiman
- * \version 1.0
- */
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-
-/*
- O = Origin = impact IcePoint
- i = normalized vector along the x axis
- j = normalized vector along the y axis = actually the normal vector in O
- D = Direction vector, norm |D| = 1
- N = Projection of D on y axis, norm |N| = normal reaction
- T = Projection of D on x axis, norm |T| = tangential reaction
- R = Reflexion vector
-
- ^y
- |
- |
- |
- _ _ _| _ _ _
- * * *|
- \ | /
- \ |N / |
- R\ | /D
- \ | / |
- \ | /
- _________\|/______*_______>x
- O T
-
- Let define theta = angle between D and N. Then cos(theta) = |N| / |D| = |N| since D is normalized.
-
- j|D = |j|*|D|*cos(theta) => |N| = j|D
-
- Then we simply have:
-
- D = N + T
-
- To compute tangential reaction :
-
- T = D - N
-
- To compute reflexion vector :
-
- R = N - T = N - (D-N) = 2*N - D
-*/
-
-///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
-// Precompiled Header
-#include "StdAfx.h"
-
-using namespace IceMaths;
-
-float Ray::SquareDistance(const IcePoint& Point, float* t) const
-{
- IcePoint Diff = Point - mOrig;
- float fT = Diff | mDir;
-
- if(fT<=0.0f)
- {
- fT = 0.0f;
- }
- else
- {
- fT /= mDir.SquareMagnitude();
- Diff -= fT*mDir;
- }
-
- if(t) *t = fT;
-
- return Diff.SquareMagnitude();
-}