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added barycentric coordinate function

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Mason 2009-09-05 21:45:50 -04:00
parent c3539bb10c
commit 1f418be366
1 changed files with 19 additions and 1 deletions
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20
src/org/poly2tri/shapes/Triangle.scala
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@ -375,8 +375,26 @@ class Triangle(val points: Array[Point]) {
val angle3 = Math.Pi - angle1 - angle2
// 30 degrees
val minAngle = Math.Pi/6
//println(angle1 + "," + angle2 + "," + angle3)
(angle1 <= minAngle || angle2 <= minAngle || angle3 <= minAngle)
}
// Compute barycentric coordinates (u, v, w) for
// point p with respect to triangle
// From "Real-Time Collision Detection" by Christer Ericson
def barycentric(p: Point): List[Float] = {
val v0 = points(1) - points(0)
val v1 = points(2) - points(0)
val v2 = p - points(0)
val d00 = v0 dot v0
val d01 = v0 dot v1
val d11 = v1 dot v1
val d20 = v2 dot v0
val d21 = v2 dot v1
val denom = d00 * d11 - d01 * d01
val v = (d11 * d20 - d01 * d21) / denom
val w = (d00 * d21 - d01 * d20) / denom
val u = 1.0f - v - w
List(u, v, w)
}
}