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selection.h

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// Polygon selection function by Alan Baylis 2003

// SelectPolygon() creates a ray from the current camera coordinates to a point half a unit into the screen that is coincident
// with the mouse coordinates passed in and checks for an intersection along the line of this ray with the array of 
// polygons passed in.
// If there is an intersection then the function returns the zero based index of the closest polygon intersected or -1
// if there was no intersection.
// The polygons passed in must have between 3 to 29 edges, be convex, non-degenerate and have their normals set. 
// MouseX and MouseY are relative to the top-left corner of the window.

#ifndef __SELECTION_H_
#define __SELECTION_H_

#include <windows.h>
#include "polygon.h"

int SelectPolygon(HWND hWnd, POLYGON* Polygons, int numPolys, int MouseX, int MouseY);

#endif

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