Update Sphere to match three.js axis
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@ -29,9 +29,10 @@ class Sphere(
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override fun <T : Any> toGeometry(geometryBuilder: GeometryBuilder<T>) {
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override fun <T : Any> toGeometry(geometryBuilder: GeometryBuilder<T>) {
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fun point3DfromSphCoord(r: Float, theta: Float, phi: Float): Point3D {
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fun point3DfromSphCoord(r: Float, theta: Float, phi: Float): Point3D {
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val z = r * cos(theta)
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// This transformation matches three.js sphere implementation
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val x = r * sin(theta) * cos(phi)
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val y = r * cos(theta)
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val y = r * sin(theta) * sin(phi)
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val z = r * sin(theta) * sin(phi)
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val x = - r * sin(theta) * cos(phi)
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return Point3D(x, y, z)
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return Point3D(x, y, z)
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}
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}
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val segments = this.detail ?: 8
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val segments = this.detail ?: 8
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@ -49,7 +50,8 @@ class Sphere(
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val point3 = point3DfromSphCoord(radius, theta2, phi2)
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val point3 = point3DfromSphCoord(radius, theta2, phi2)
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val point4 = point3DfromSphCoord(radius, theta2, phi1)
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val point4 = point3DfromSphCoord(radius, theta2, phi1)
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geometryBuilder.apply {
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geometryBuilder.apply {
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face4(point1, point2, point3, point4)
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// 1-2-3-4 gives the same face but with opposite orientation
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face4(point1, point4, point3, point2)
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}
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}
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}
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}
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}
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}
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