38 lines
1.3 KiB
C++
38 lines
1.3 KiB
C++
//
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// Created by dawsh on 1/25/24.
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//
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#pragma once
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#include "Plane.h"
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namespace Geometry
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{
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class Frustum {
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public:
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Plane TopFace;
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Plane BottomFace;
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Plane RightFace;
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Plane LeftFace;
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Plane FarFace;
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Plane NearFace;
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static Frustum CreateFrustumFromCamera(const Camera& cam, float aspect, float fovY, float zNear, float zFar);
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};
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Frustum Frustum::CreateFrustumFromCamera(const Camera &cam, float aspect, float fovY, float zNear, float zFar) {
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Frustum frustum;
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const float halfVSide = zFar * tanf(fovY * 0.5f);
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const float halfHSide = halfVSide * aspect;
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const Vector3 frontMultFar = cam.Front * zFar;
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frustum.NearFace = Plane{cam.Position + cam.Front * zNear, cam.Front};
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frustum.FarFace = Plane{cam.Position + frontMultFar, -cam.Front};
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frustum.RightFace = Plane{cam.Position, Vector3::Cross(frontMultFar - cam.Right * halfHSide, cam.Up)};
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frustum.LeftFace = Plane{cam.Position, Vector3::Cross(cam.Up, frontMultFar+cam.Right*halfHSide)};
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frustum.TopFace = Plane{cam.Position, Vector3::Cross(cam.Right, frontMultFar - cam.Up * halfVSide)};
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frustum.BottomFace = Plane{cam.Position, Vector3::Cross(frontMultFar + cam.Up * halfVSide, cam.Right)};
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return frustum;
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}
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} |