/// <summary>
/// Append a new face to the ProBuilderMesh.
/// </summary>
/// <param name="mesh">The mesh target.</param>
/// <param name="positions">The new vertex positions to add.</param>
/// <param name="colors">The new colors to add (must match positions length).</param>
/// <param name="uvs">The new uvs to add (must match positions length).</param>
/// <param name="face">A face with the new triangle indexes. The indexes should be 0 indexed.</param>
/// <param name="common"></param>
/// <returns>The new face as referenced on the mesh.</returns>
internal static Face AppendFace(
this ProBuilderMesh mesh,
Vector3[] positions,
Color[] colors,
Vector2[] uv0s,
Vector4[] uv2s,
Vector4[] uv3s,
Face face,
int[] common)
{
if (mesh == null)
{
throw new ArgumentNullException("mesh");
}
if (positions == null)
{
throw new ArgumentNullException("positions");
}
if (face == null)
{
throw new ArgumentNullException("face");
}
int faceVertexCount = positions.Length;
if (common == null)
{
common = new int[faceVertexCount];
for (int i = 0; i < faceVertexCount; i++)
{
common[i] = -1;
}
}
int vertexCount = mesh.vertexCount;
var mc = mesh.HasArrays(MeshArrays.Color);
var fc = colors != null;
var mt0 = mesh.HasArrays(MeshArrays.Texture0);
var ft0 = uv0s != null;
var mt2 = mesh.HasArrays(MeshArrays.Texture2);
var ft2 = uv2s != null;
var mt3 = mesh.HasArrays(MeshArrays.Texture3);
var ft3 = uv3s != null;
Vector3[] newPositions = new Vector3[vertexCount + faceVertexCount];
Color[] newColors = (mc || fc) ? new Color[vertexCount + faceVertexCount] : null;
Vector2[] newTexture0s = (mt0 || ft0) ? new Vector2[vertexCount + faceVertexCount] : null;
List <Vector4> newTexture2s = (mt2 || ft2) ? new List <Vector4>() : null;
List <Vector4> newTexture3s = (mt3 || ft3) ? new List <Vector4>() : null;
List <Face> faces = new List <Face>(mesh.facesInternal);
Array.Copy(mesh.positionsInternal, 0, newPositions, 0, vertexCount);
Array.Copy(positions, 0, newPositions, vertexCount, faceVertexCount);
if (mc || fc)
{
Array.Copy(mc ? mesh.colorsInternal : ArrayUtility.Fill(Color.white, vertexCount), 0, newColors, 0,
vertexCount);
Array.Copy(fc ? colors : ArrayUtility.Fill(Color.white, faceVertexCount), 0, newColors, vertexCount,
colors.Length);
}
if (mt0 || ft0)
{
Array.Copy(mt0 ? mesh.texturesInternal : ArrayUtility.Fill(Vector2.zero, vertexCount), 0, newTexture0s, 0,
vertexCount);
Array.Copy(ft0 ? uv0s : ArrayUtility.Fill(Vector2.zero, faceVertexCount), 0, newTexture0s,
mesh.texturesInternal.Length, faceVertexCount);
}
if (mt2 || ft2)
{
newTexture2s.AddRange(mt2 ? mesh.textures2Internal : new Vector4[vertexCount].ToList());
newTexture2s.AddRange(ft2 ? uv2s : new Vector4[faceVertexCount]);
}
if (mt3 || ft3)
{
newTexture3s.AddRange(mt3 ? mesh.textures3Internal : new Vector4[vertexCount].ToList());
newTexture3s.AddRange(ft3 ? uv3s : new Vector4[faceVertexCount]);
}
face.ShiftIndexesToZero();
face.ShiftIndexes(vertexCount);
faces.Add(face);
for (int i = 0; i < common.Length; i++)
{
if (common[i] < 0)
{
mesh.AddSharedVertex(new SharedVertex(new int[] { i + vertexCount }));
}
else
{
mesh.AddToSharedVertex(common[i], i + vertexCount);
}
}
mesh.positions = newPositions;
mesh.colors = newColors;
mesh.textures = newTexture0s;
mesh.faces = faces;
mesh.textures2Internal = newTexture2s;
mesh.textures3Internal = newTexture3s;
return(face);
}