public static bool Paint(IBrush brush, Texture2D texture, MeshCollider meshCollider)
{
int[] triangles = brush.GetAffectedTriangles(meshCollider);
Mesh mesh = meshCollider.sharedMesh;
Transform meshTransform = meshCollider.transform;
if (mesh != prevMesh)
{
prevMesh = mesh;
meshTriangles = mesh.triangles;
meshVertices = mesh.vertices;
meshUVs = mesh.uv;
}
Rect bigUVRect = new Rect(-1, -1, 0, 0);
for (int t = 0; t < triangles.Length; t++)
{
int triangleIndex = triangles[t];
int[] triangle = new int[3];
triangle[0] = meshTriangles[triangleIndex * 3];
triangle[1] = meshTriangles[triangleIndex * 3 + 1];
triangle[2] = meshTriangles[triangleIndex * 3 + 2];
Vector2[] triangleUVs = new Vector2[3];
triangleUVs[0] = meshUVs[triangle[0]];
triangleUVs[1] = meshUVs[triangle[1]];
triangleUVs[2] = meshUVs[triangle[2]];
Rect uvRect = GetUVRect(triangleUVs);
bigUVRect = MergeRects(bigUVRect, uvRect);
}
int x = Mathf.FloorToInt(bigUVRect.x * texture.width);
int y = Mathf.FloorToInt(bigUVRect.y * texture.height);
int width = Mathf.FloorToInt(bigUVRect.width * texture.width);
int height = Mathf.FloorToInt(bigUVRect.height * texture.height);
Color[] cols = texture.GetPixels(x, y, width, height);
//Debug.Log("colouring a " + width + "x" + height + " patch");
for (int t = 0; t < triangles.Length; t++)
{
int triangleIndex = triangles[t];
int[] triangle = new int[3];
triangle[0] = meshTriangles[triangleIndex * 3];
triangle[1] = meshTriangles[triangleIndex * 3 + 1];
triangle[2] = meshTriangles[triangleIndex * 3 + 2];
Vector3[] triangleVerts = new Vector3[3];
triangleVerts[0] = meshVertices[triangle[0]];
triangleVerts[1] = meshVertices[triangle[1]];
triangleVerts[2] = meshVertices[triangle[2]];
Vector2[] triangleUVs = new Vector2[3];
triangleUVs[0] = meshUVs[triangle[0]];
triangleUVs[1] = meshUVs[triangle[1]];
triangleUVs[2] = meshUVs[triangle[2]];
Rect uvRect = GetUVRect(triangleUVs);
ColourPixels(ref cols, brush, triangleUVs, triangleVerts, meshTransform, uvRect, bigUVRect, texture.width, texture.height);
}
texture.SetPixels(x, y, width, height, cols);
texture.Apply();
return(triangles.Length > 0);
}