void FindBackMirrored(List <Vec3> uvs, UVSpecs specs)
{
switch (specs.Rotation)
{
case 4:
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(specs.H, 0, specs.Texture));
uvs.Add(new Vec3(specs.H, specs.W, specs.Texture));
uvs.Add(new Vec3(0, specs.W, specs.Texture));
break;
case 5:
uvs.Add(new Vec3(0, specs.H, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(specs.W, 0, specs.Texture));
uvs.Add(new Vec3(specs.W, specs.H, specs.Texture));
break;
case 6:
uvs.Add(new Vec3(specs.H, specs.W, specs.Texture));
uvs.Add(new Vec3(0, specs.W, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(specs.H, 0, specs.Texture));
break;
case 7:
uvs.Add(new Vec3(specs.W, 0, specs.Texture));
uvs.Add(new Vec3(specs.W, specs.H, specs.Texture));
uvs.Add(new Vec3(0, specs.H, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
break;
}
}
void FindBackNormal(List <Vec3> uvs, UVSpecs specs)
{
switch (specs.Rotation)
{
case 0:
uvs.Add(new Vec3(specs.H, 0, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(0, specs.W, specs.Texture));
uvs.Add(new Vec3(specs.H, specs.W, specs.Texture));
break;
case 1:
uvs.Add(new Vec3(specs.W, specs.H, specs.Texture));
uvs.Add(new Vec3(specs.W, 0, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(0, specs.H, specs.Texture));
break;
case 2:
uvs.Add(new Vec3(0, specs.W, specs.Texture));
uvs.Add(new Vec3(specs.H, specs.W, specs.Texture));
uvs.Add(new Vec3(specs.H, 0, specs.Texture));
uvs.Add(new Vec3(0, 0, specs.Texture));
break;
case 3:
uvs.Add(new Vec3(0, 0, specs.Texture));
uvs.Add(new Vec3(0, specs.H, specs.Texture));
uvs.Add(new Vec3(specs.W, specs.H, specs.Texture));
uvs.Add(new Vec3(specs.W, 0, specs.Texture));
break;
}
}
void FindFront(List <Vec3> uvs, UVSpecs specs)
{
if (specs.Rotation < 4)
{
FindFrontNormal(uvs, specs);
}
else
{
FindFrontMirrored(uvs, specs);
}
}
void FindBack(List <Vec3> uvs, UVSpecs specs)
{
if (specs.Rotation < 4)
{
FindBackNormal(uvs, specs);
}
else
{
FindBackMirrored(uvs, specs);
}
}
void CorrectYFaces(ref UVSpecs specs)
{
// Flip top and bottom sides.
if (specs.Side == 3)
{
specs.Side = 2;
}
else if (specs.Side == 2)
{
specs.Side = 3;
}
}
void ValidateQuad(UVSpecs specs)
{
if (specs.Side < 0 || specs.Side > 5)
{
throw new System.ArgumentException($"Unknown side {specs.Side}!");
}
if (specs.Rotation < 0 || specs.Rotation > 7)
{
throw new System.ArgumentException($"Unknown rotation {specs.Rotation}!");
}
}
/// <summary>
/// Retrieves the given uv coords and stores them in the uv list.
/// </summary>
/// <param name="uvs">The list of UVs to write to.</param>
/// <param name="specs">The quad uv information.</param>
public void Find(List <Vec3> uvs, UVSpecs specs)
{
ValidateQuad(specs);
CorrectYFaces(ref specs);
if (specs.Side % 2 == 0)
{
FindFront(uvs, specs);
}
else
{
FindBack(uvs, specs);
}
}
