public static List <TextureVertex> BuildQuad(Vector3[] orderedVertices, bool splitFromTopLeft /*Determines whether quad is split into tris from top left corner or top right*/, Vector3 normal, TextureName topTriTexture, TextureName bottomTriTexture)
{
//Quad:
//0-----1
// | |
// | |
// 3-----2
List <TextureVertex> result = new List <TextureVertex>();
//NOTE: Retrieve texture Coords from texture atlas. Need to check if not null
Vector2[] textureCoordinatesTopTriangle = TextureAtlas.GetInstance().GetTextureCoordinates(topTriTexture); //new Vector2[4];
Vector2[] textureCoordinatesBottomTriangle = TextureAtlas.GetInstance().GetTextureCoordinates(bottomTriTexture); //new Vector2[4];
if (orderedVertices.Length == 4) //Must have 4 vertices for a quad
{
//Determine if quad is split 0-2 (top left) of 1-3 (top right)
if (splitFromTopLeft)
{
for (int i = 0; i <= 2; i++)//Top right triangle
{
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[i], normal, textureCoordinatesTopTriangle[i]), topTriTexture));
}
//NOTE: Include all in loop
//Bottom left triangle
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[2], normal, textureCoordinatesBottomTriangle[2]), bottomTriTexture));
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[3], normal, textureCoordinatesBottomTriangle[3]), bottomTriTexture));
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[0], normal, textureCoordinatesBottomTriangle[0]), bottomTriTexture));
}
else
{
//Top Left triangle
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[3], normal, textureCoordinatesTopTriangle[3]), topTriTexture));
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[0], normal, textureCoordinatesTopTriangle[0]), topTriTexture));
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[1], normal, textureCoordinatesTopTriangle[1]), topTriTexture));
//Bottom right triangle
for (int i = 1; i <= 3; i++)
{
result.Add(new TextureVertex(new VertexPositionNormalTexture(orderedVertices[i], normal, textureCoordinatesBottomTriangle[i]), bottomTriTexture));
}
}
}
return(result);
}