Making a Procedural Cube Mesh

Questions & Answers
1

5293-procedural_cube.png

I’m attempting to make a procedural mesh on a cube. I only want the sides to have the mesh, not the top or bottom.

For the vertices I’m doing the following:

// create the vertices array
for ( int ptsIndex = 0; ptsIndex < numVerts; ptsIndex++ ){
// x, y, z are generated here ...
// blah, blah, blah

	switch ( ptsIndex % 4 ){
	case 0:
		verts[ ptsIndex ] = new Vector3( x + deltaValue, y, z - deltaValue );
		break;
	case 1:
		verts[ ptsIndex ] = new Vector3( x + deltaValue, y, z + deltaValue );
		break;
	case 2:
		verts[ ptsIndex ] = new Vector3( x - deltaValue, y, z + deltaValue );
		break;
	case 3:
		verts[ ptsIndex ] = new Vector3( x - deltaValue, y, z - deltaValue );
		break;
	}
}

Then I create my triangle array:

mesh.triangles = new int[]{ 0, 1, 5,
                            0, 4, 5,
                            1, 2, 6,
                            1, 5, 6,
                            2, 3, 7,
                            2, 6, 7,
                            3, 0, 4,
                            3, 7, 4 };

And finally assign everything:

	mesh.vertices = verts;
	mesh.triangles = tris;
		
	mesh.RecalculateNormals();
	mesh.RecalculateBounds();
	mesh.Optimize();

Here is a screen shot of what I’m getting:

5295-procedural_cube_screenshot.png

If any of you have any ideas on what I’m doing wrong I would love to hear it!

Thanks!

Jim

2

It’s called Vertex Winding. The clock-wise counter-clockwise order of your verts will determine which direction is the front, in the absence of providing a normal vector.