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improve frustum calculation speed

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Bixilon 2022-09-03 20:36:16 +02:00
parent 3665c1c615
commit f51c85683c
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1 changed files with 26 additions and 16 deletions
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42
src/main/java/de/bixilon/minosoft/gui/rendering/camera/frustum/Frustum.kt
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@ -53,27 +53,37 @@ class Frustum(
matrix[3] + matrix[2],
matrix[3] - matrix[2],
)
val planesVec3 = arrayOf(
Vec3(planes[0]),
Vec3(planes[1]),
Vec3(planes[2]),
Vec3(planes[3]),
Vec3(planes[4]),
Vec3(planes[5]),
)
val crosses = arrayOf(
Vec3(planes[Planes.LEFT]) cross Vec3(planes[Planes.RIGHT]),
Vec3(planes[Planes.LEFT]) cross Vec3(planes[Planes.BOTTOM]),
Vec3(planes[Planes.LEFT]) cross Vec3(planes[Planes.TOP]),
Vec3(planes[Planes.LEFT]) cross Vec3(planes[Planes.NEAR]),
Vec3(planes[Planes.LEFT]) cross Vec3(planes[Planes.FAR]),
planesVec3[Planes.LEFT] cross planesVec3[Planes.RIGHT],
planesVec3[Planes.LEFT] cross planesVec3[Planes.BOTTOM],
planesVec3[Planes.LEFT] cross planesVec3[Planes.TOP],
planesVec3[Planes.LEFT] cross planesVec3[Planes.NEAR],
planesVec3[Planes.LEFT] cross planesVec3[Planes.FAR],
Vec3(planes[Planes.RIGHT]) cross Vec3(planes[Planes.BOTTOM]),
Vec3(planes[Planes.RIGHT]) cross Vec3(planes[Planes.TOP]),
Vec3(planes[Planes.RIGHT]) cross Vec3(planes[Planes.NEAR]),
Vec3(planes[Planes.RIGHT]) cross Vec3(planes[Planes.FAR]),
planesVec3[Planes.RIGHT] cross planesVec3[Planes.BOTTOM],
planesVec3[Planes.RIGHT] cross planesVec3[Planes.TOP],
planesVec3[Planes.RIGHT] cross planesVec3[Planes.NEAR],
planesVec3[Planes.RIGHT] cross planesVec3[Planes.FAR],
Vec3(planes[Planes.BOTTOM]) cross Vec3(planes[Planes.TOP]),
Vec3(planes[Planes.BOTTOM]) cross Vec3(planes[Planes.NEAR]),
Vec3(planes[Planes.BOTTOM]) cross Vec3(planes[Planes.FAR]),
planesVec3[Planes.BOTTOM] cross planesVec3[Planes.TOP],
planesVec3[Planes.BOTTOM] cross planesVec3[Planes.NEAR],
planesVec3[Planes.BOTTOM] cross planesVec3[Planes.FAR],
Vec3(planes[Planes.TOP]) cross Vec3(planes[Planes.NEAR]),
Vec3(planes[Planes.TOP]) cross Vec3(planes[Planes.FAR]),
planesVec3[Planes.TOP] cross planesVec3[Planes.NEAR],
planesVec3[Planes.TOP] cross planesVec3[Planes.FAR],
Vec3(planes[Planes.NEAR]) cross Vec3(planes[Planes.FAR]),
planesVec3[Planes.NEAR] cross planesVec3[Planes.FAR],
)
fun ij2k(i: Planes, j: Planes): Int {
@ -81,7 +91,7 @@ class Frustum(
}
fun intersections(a: Planes, b: Planes, c: Planes): Vec3 {
val d = Vec3(planes[a]) dot crosses[ij2k(b, c)]
val d = planesVec3[a] dot crosses[ij2k(b, c)]
val res = Mat3(crosses[ij2k(b, c)], -crosses[ij2k(a, c)], crosses[ij2k(a, b)]) * Vec3(planes[a].w, planes[b].w, planes[c].w)
return res * (-1.0f / d)
}