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Implement CreateFrustumFromCoordinateFrame()

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josh
2024-01-30 21:29:01 -05:00
parent 09d0391c85
commit 239c90f75b
1 changed files with 19 additions and 0 deletions
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19
src/J3ML/Geometry/Frustum.cpp
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@@ -1 +1,20 @@
#include <J3ML/Geometry/Frustum.h>
namespace Geometry
{
Frustum Frustum::CreateFrustumFromCamera(const CoordinateFrame &cam, float aspect, float fovY, float zNear, float zFar) {
Frustum frustum;
const float halfVSide = zFar * tanf(fovY * 0.5f);
const float halfHSide = halfVSide * aspect;
const Vector3 frontMultFar = cam.Front * zFar;
frustum.NearFace = Plane{cam.Position + cam.Front * zNear, cam.Front};
frustum.FarFace = Plane{cam.Position + frontMultFar, -cam.Front};
frustum.RightFace = Plane{cam.Position, Vector3::Cross(frontMultFar - cam.Right * halfHSide, cam.Up)};
frustum.LeftFace = Plane{cam.Position, Vector3::Cross(cam.Up, frontMultFar+cam.Right*halfHSide)};
frustum.TopFace = Plane{cam.Position, Vector3::Cross(cam.Right, frontMultFar - cam.Up * halfVSide)};
frustum.BottomFace = Plane{cam.Position, Vector3::Cross(frontMultFar + cam.Up * halfVSide, cam.Right)};
return frustum;
}
}