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#pragma once
#include "Vector4.h"
#include "Plane3.h"
#include "Matrix4.h"
#include "ViewProjection.h"
class Viewer :
public Vector4
{
public:
Viewer() :
Vector4()
{}
Viewer(const Vector4& other) :
Vector4(other)
{}
Viewer(const Vector3& vec3, ElementType w) :
Vector4(vec3, w)
{}
static Viewer createFromTransformedViewer(const Vector4& viewer, const Matrix4& transform);
static Viewer createFromViewProjection(const ViewProjection& viewproj);
bool testPlane(const Plane3& plane) const;
bool testPlane(const Plane3& plane, const Matrix4& localToWorld) const;
bool testTriangle(const Vector3& p0, const Vector3& p1, const Vector3& p2) const;
};
inline bool Viewer::testPlane(const Plane3& plane) const
{
return (plane.normal().x() * x()) + (plane.normal().y() * y()) +
(plane.normal().z() * z()) + (plane.dist() * w()) > 0;
}
inline bool Viewer::testPlane(const Plane3& plane, const Matrix4& localToWorld) const
{
return testPlane(plane.transformed(localToWorld));
}
inline Viewer Viewer::createFromTransformedViewer(const Vector4& viewer, const Matrix4& transform)
{
if (viewer.w() == 0)
{
return Viewer(transform.transformDirection(viewer.getVector3()), 0);
}
else
{
return Viewer(transform.transformPoint(viewer.getVector3()), viewer.w());
}
}
inline Vector3 triangle_cross(const Vector3& p0, const Vector3& p1, const Vector3& p2)
{
return (p1 - p0).cross(p1 - p2);
}
inline bool Viewer::testTriangle(const Vector3& p0, const Vector3& p1, const Vector3& p2) const
{
Vector3 cross = triangle_cross(p0, p1, p2);
return (x() * cross[0]) + (y() * cross[1]) + (z() * cross[2]) > 0;
}
inline Viewer Viewer::createFromViewProjection(const ViewProjection& viewproj)
{
// get viewer pos in object coords
Vector4 viewer(viewproj.getFullInverse().transform(Vector4(0, 0, -1, 0)));
if (viewer[3] != 0) // non-affine matrix
{
viewer[0] /= viewer[3];
viewer[1] /= viewer[3];
viewer[2] /= viewer[3];
viewer[3] /= viewer[3];
}
return viewer;
}
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