public Vector3 CalcBarycentricCoords(Vector3 point)
{
Vector3 result;
Triangle3.CalcBarycentricCoords(ref point, ref this.V0, ref this.V1, ref this.V2, out result);
return(result);
}
/// <summary>
/// Sampples an array of random points on the surface. Users can provide additional parameters for sampling.
/// Sample map controls the chance of sampling (texture is read from r channel), where white gives maximum chance
/// and black gives no chance. To read the texture an array of uv coordinates is used. It's also possible to
/// explicitly set additional range of chances (so that if sample map has gradient from 0 to 1, then adding
/// min to 0.5 will result in no samples generated in areas with color <= 0.5). Notice that in this function
/// count is upper bound of samples to generate, resulting array may have less samples due to some samples
/// being rejected according to sample map.
/// </summary>
public Vector3[] SampleArray(int count, Vector2[] uvs, Texture2D sampleMap, float min = 0f, float max = 1f)
{
Vector3[] temp = new Vector3[count];
int c = 0;
for (int i = 0; i < count; ++i)
{
int index = SampleIndex() * 3;
int i0 = _indices[index];
int i1 = _indices[index + 1];
int i2 = _indices[index + 2];
Vector3 v0 = _vertices[i0];
Vector3 v1 = _vertices[i1];
Vector3 v2 = _vertices[i2];
Vector3 vec = _rand.InTriangle(ref v0, ref v1, ref v2);
Vector3 bary;
Triangle3.CalcBarycentricCoords(ref vec, ref v0, ref v1, ref v2, out bary);
Vector2 uv = uvs[i0] * bary.x + uvs[i1] * bary.y + uvs[i2] * bary.z;
float factor = sampleMap.GetPixelBilinear(uv.x, uv.y).r;
if (min <= factor && factor <= max && _rand.NextFloat() < factor)
{
temp[c] = vec;
++c;
}
}
Vector3[] result = new Vector3[temp.Length];
System.Array.Copy(temp, result, temp.Length);
return(result);
}
public static Vector3 CalcAnglesRad(Vector3 v0, Vector3 v1, Vector3 v2)
{
return(Triangle3.CalcAnglesRad(ref v0, ref v1, ref v2));
}