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Torque/SDK/lib/maxsdk31/gutil.h

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+/**********************************************************************
+ *<
+	FILE: gutil.h
+
+	DESCRIPTION: Geometric utility functions
+
+	CREATED BY: Dan Silva
+
+	HISTORY:
+
+ *>	Copyright (c) 1994, All Rights Reserved.
+ **********************************************************************/
+
+#ifndef _GUTIL_H 
+
+#define _GUTIL_H
+
+
+//- BaryCoords-----------------------------------------------------
+// Given three points in space forming a triangle (p0,p1,p2), 
+// and a fourth point in the plane of that triangle, returns the
+// barycentric coords of that point relative to the triangle.
+
+DllExport Point3 BaryCoords(Point3 p0, Point3 p1, Point3 p2, Point3 p);
+
+// Same thing in 2D
+DllExport Point3 BaryCoords(Point2 p0, Point2 p1, Point2 p2, Point2 p);
+
+
+
+//--RayHitsBox--------------------------------------------------------
+// Returns true of the ray pierces the box
+
+DllExport BOOL RayHitsBox(Ray &ray, Box3 &b);
+
+
+// DistPtToLine ---------------------------------------------------------
+// find distance of q from line p0->p1 
+
+DllExport float  DistPtToLine(Point2 *p0, Point2 *p1, Point2 *q );
+
+
+// Dist3DPtToLine ---------------------------------------------------------
+// find distance of q from line p0->p1 
+
+DllExport float  Dist3DPtToLine(Point3* p0, Point3* p1, Point3*  q );
+
+
+//----------------------------------------------------------------------
+// Computing the 3 Bump basis vectors from the UVW's at the triangle.
+//
+//  input:
+//    tv: texture coordinates at 3 triangle vertices
+//    v: coordinates of triangle vertices (usually in camera space)
+//
+// output:
+//    bvec: the 3 bump basis vectors (normalized) corresponding to the U,V,and W axes.
+//
+DllExport void ComputeBumpVectors(const Point3 tv[3], const Point3 v[3], Point3 bvec[3]);
+
+
+
+//-------------------------------------------------------------------------------
+// Quick and dirty unit vector compression. Only accurate to 1 part in 512
+//
+ULONG DllExport CompressNormal(Point3 p);
+
+Point3 DllExport DeCompressNormal(ULONG n);
+
+//-------------------------------------------------------------------------------
+// JH 10/05/98
+// Method to come up with an arbitray axis system given an "up" direction
+// Conforms to the AutoCAD algorithm
+void DllExport ArbAxis(const Point3& zAxis, Matrix3& matrix);
+
+
+
+
+#endif