95 lines
3.1 KiB
C
Executable File
95 lines
3.1 KiB
C
Executable File
/**********************************************************************
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*<
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FILE: gutil.h
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DESCRIPTION: Geometric utility functions
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CREATED BY: Dan Silva
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HISTORY:
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*> Copyright (c) 1994, All Rights Reserved.
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**********************************************************************/
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#ifndef _GUTIL_H
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#define _GUTIL_H
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//- BaryCoords-----------------------------------------------------
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// Given three points in space forming a triangle (p0,p1,p2),
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// and a fourth point in the plane of that triangle, returns the
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// barycentric coords of that point relative to the triangle.
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DllExport Point3 BaryCoords(Point3 p0, Point3 p1, Point3 p2, Point3 p);
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// Same thing in 2D
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DllExport Point3 BaryCoords(Point2 p0, Point2 p1, Point2 p2, Point2 p);
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//--RayHitsBox--------------------------------------------------------
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// Returns true of the ray pierces the box
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DllExport BOOL RayHitsBox(Ray &ray, Box3 &b);
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// DistPtToLine ---------------------------------------------------------
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// find distance of q from line p0->p1
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DllExport float DistPtToLine(Point2 *p0, Point2 *p1, Point2 *q );
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// Dist3DPtToLine ---------------------------------------------------------
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// find distance of q from line p0->p1
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DllExport float Dist3DPtToLine(Point3* p0, Point3* p1, Point3* q );
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//----------------------------------------------------------------------
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// USE CompBumpVec2D INSTEAD! This is here for compatibility only.
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//
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// Computing the 3 Bump basis vectors from the UVW's at the triangle.
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//
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// input:
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// tv: texture coordinates at 3 triangle vertices
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// v: coordinates of triangle vertices (usually in camera space)
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//
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// output:
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// bvec: the 3 bump basis vectors (normalized) corresponding to the U,V,and W axes.
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//
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DllExport void ComputeBumpVectors(const Point3 tv[3], const Point3 v[3], Point3 bvec[3]);
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//----------------------------------------------------------------------
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// Computing the 2 Bump basis vectors from the UV, VW, or WU at a triangle.
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//
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// input:
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// axis: 0=>UV, 1=>VW, 2=>WU ( use defined constants AXIS_UV, AXIS_VW, AXIS_WU in imtl.h
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// tv: texture coordinates at 3 triangle vertices
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// v: coordinates of triangle vertices (usually in camera space)
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//
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// output:
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// bvec: the 2 bump basis vectors (normalized) corresponding to the specified axes.
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//
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// THIS IS THE RECOMMENDED WAY TO COMPUTE BUMP VECTORS, NOT ComputeBumpVectors, which
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// can give erroneous results
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DllExport void ComputeBumpVec2D(int axis, const Point3 tv[3], const Point3 v[3], Point3 bvec[2]);
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//-------------------------------------------------------------------------------
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// Quick and dirty unit vector compression. Only accurate to 1 part in 512
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//
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ULONG DllExport CompressNormal(Point3 p);
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Point3 DllExport DeCompressNormal(ULONG n);
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//-------------------------------------------------------------------------------
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// JH 10/05/98
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// Method to come up with an arbitray axis system given an "up" direction
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// Conforms to the AutoCAD algorithm
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void DllExport ArbAxis(const Point3& zAxis, Matrix3& matrix);
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#endif |