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Added box, plane and sphere mesh generators

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Edwin Jakobs
2018-11-25 16:56:07 +01:00
parent dc343d384c
commit fdf1ac8832
4 changed files with 184 additions and 0 deletions
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50
orx-mesh-generators/src/main/kotlin/Sphere.kt Normal file
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package org.openrndr.extras.meshgenerators
import org.openrndr.draw.VertexBuffer
import org.openrndr.math.Spherical
import org.openrndr.math.Vector2
fun sphereMesh(sides:Int, segments:Int, radius: Double): VertexBuffer {
val vertexCount = 2 * sides * 3 + Math.max(0, (segments-2)) * sides * 6
val vb = meshVertexBuffer(vertexCount)
vb.put {
generateSphere(sides, segments, radius, bufferWriter(this))
}
return vb
}
fun generateSphere(sides: Int, segments: Int, radius: Double = 1.0, writer: VertexWriter) {
for (t in 0 until segments) {
for (s in 0 until sides) {
val st00 = Spherical(radius, s*Math.PI*2.0/sides, t*Math.PI/segments)
val st01 = Spherical(radius, s*Math.PI*2.0/sides, (t+1)*Math.PI/segments)
val st10 = Spherical(radius, (s+1)*Math.PI*2.0/sides, t*Math.PI/segments)
val st11 = Spherical(radius, (s+1)*Math.PI*2.0/sides, (t+1)*Math.PI/segments)
val thetaMax = Math.PI
val phiMax = Math.PI*2.0
when (t) {
0 -> {
writer(st00.cartesian, st00.cartesian.normalized, Vector2(st00.phi/phiMax, st00.theta/thetaMax))
writer(st01.cartesian, st01.cartesian.normalized, Vector2(st01.phi/phiMax, st01.theta/thetaMax))
writer(st11.cartesian, st11.cartesian.normalized, Vector2(st11.phi/phiMax, st11.theta/thetaMax))
}
segments-1 -> {
writer(st00.cartesian, st00.cartesian.normalized, Vector2(st00.phi/phiMax, st00.theta/thetaMax))
writer(st10.cartesian, st10.cartesian.normalized, Vector2(st10.phi/phiMax, st10.theta/thetaMax))
writer(st11.cartesian, st11.cartesian.normalized, Vector2(st11.phi/phiMax, st11.theta/thetaMax))
}
else -> {
writer(st00.cartesian, st00.cartesian.normalized, Vector2(st00.phi/phiMax, st00.theta/thetaMax))
writer(st10.cartesian, st10.cartesian.normalized, Vector2(st10.phi/phiMax, st10.theta/thetaMax))
writer(st11.cartesian, st11.cartesian.normalized, Vector2(st11.phi/phiMax, st11.theta/thetaMax))
writer(st11.cartesian, st11.cartesian.normalized, Vector2(st11.phi/phiMax, st11.theta/thetaMax))
writer(st01.cartesian, st01.cartesian.normalized, Vector2(st01.phi/phiMax, st01.theta/thetaMax))
writer(st00.cartesian, st00.cartesian.normalized, Vector2(st00.phi/phiMax, st00.theta/thetaMax))
}
}
}
}
}