/// <summary>
/// get uv from pyramid texture map
/// </summary>
/// <param name="side">side of the pyramid</param>
/// <param name="baryCoords">point in barycentric coordinates in respect to side of the pyramid</param>
/// <returns>uv coordinate of a point</returns>
static Vector2 GetPyramidUVMap(PyramidSide side, Vector3 baryCoords)
{
var a = new Vector2(2.0f / (2 + Mathf.Sqrt(3)), 0.5f);
switch (side)
{
case PyramidSide.side0:
return(new Vector2(baryCoords.x * a.x + baryCoords.y * a.x + baryCoords.z * 1,
baryCoords.x * a.y + baryCoords.y * 0.0f + baryCoords.z * (a.y / 2)));
case PyramidSide.side1:
return(new Vector2(baryCoords.x * a.x + baryCoords.y * 1 + baryCoords.z * 1,
baryCoords.x * a.y + baryCoords.y * a.y / 2.0f + baryCoords.z * (a.y * 3.0f / 2.0f)));
case PyramidSide.side2:
return(new Vector2(baryCoords.x * a.x + baryCoords.y * 1 + baryCoords.z * a.x,
baryCoords.x * a.y + baryCoords.y * (a.y * 3.0f / 2.0f) + baryCoords.z * 1));
case PyramidSide.side3:
return(new Vector2(baryCoords.x * a.x + baryCoords.y * a.x + baryCoords.z * (a.x - a.y * Mathf.Sqrt(3.0f) / 2.0f),
baryCoords.x * a.y + baryCoords.y * 1 + baryCoords.z * (a.y * 3.0f / 2.0f)));
case PyramidSide.bottom:
return(new Vector2(baryCoords.x * a.x, baryCoords.y * a.y));
}
return(Vector2.zero);
}
/// <summary>
/// get uv from pyramid texture map
/// </summary>
/// <param name="side">side of the pyramid</param>
/// <param name="baryCoords">point in barycentric coordinates in respect to side of the pyramid</param>
/// <returns>uv coordinate of a point</returns>
static Vector2 GetPyramidUVMap(PyramidSide side, Vector3 baryCoords)
{
var a = new Vector2(2.0f/(2 + Mathf.Sqrt(3)), 0.5f);
switch (side)
{
case PyramidSide.side0:
return new Vector2(baryCoords.x*a.x + baryCoords.y*a.x + baryCoords.z*1,
baryCoords.x*a.y + baryCoords.y*0.0f + baryCoords.z*(a.y/2));
case PyramidSide.side1:
return new Vector2(baryCoords.x * a.x + baryCoords.y * 1 + baryCoords.z * 1,
baryCoords.x * a.y + baryCoords.y * a.y / 2.0f + baryCoords.z * (a.y * 3.0f / 2.0f));
case PyramidSide.side2:
return new Vector2(baryCoords.x * a.x + baryCoords.y * 1 + baryCoords.z * a.x,
baryCoords.x * a.y + baryCoords.y * (a.y * 3.0f/2.0f) + baryCoords.z * 1);
case PyramidSide.side3:
return new Vector2(baryCoords.x*a.x + baryCoords.y*a.x + baryCoords.z*(a.x- a.y * Mathf.Sqrt(3.0f)/2.0f),
baryCoords.x*a.y + baryCoords.y*1 + baryCoords.z*(a.y*3.0f/2.0f));
case PyramidSide.bottom:
return new Vector2(baryCoords.x*a.x, baryCoords.y*a.y);
}
return Vector2.zero;
}
