Procedural Mesh - Mesh Faces

Unity Engine
1

Hi, once again :),

I have a basic voxel engine up and running but now I want to be able to use raycasts to add and delete blocks.

The problem I have is when I use the raycast it selects the block according to the raycastHit.point. This works from above but when clicking on either side it tends not to choose the block I clicked on but rather the on on either side.

Has anyone got an easy method for clicking on a block ? :slight_smile:

2

Not Working - Read edit below :slight_smile:

Got it working :slight_smile:
I just used this script to get the actual block I was clicking on.

var blockVector = Vector3(hit.point.x, (hit.point.y)*-1+1, hit.point.z);
		blockVector -= Vector3(hit.normal.x/2, (hit.normal.y/2)*-1,hit.normal.z/2);
		
		blockVector.x = Mathf.Floor(blockVector.x);
		blockVector.y = Mathf.Floor(blockVector.y);
		blockVector.z = Mathf.Floor(blockVector.z);

and to select the block next to the clicked face just add hit.normal to the blockVector :slight_smile:

Edit: Now I’m getting a new problem. When using the above code I get a number for each axis (x, y, z) and on each side it can sometimes take the number down 1 editing the block its facing. e.g. clicking the top block should have the axis (x, 4, z) but randomly it rounds the 4 down to 3. How would I get around this even though the face is perfectly level with 4?
I am using Mathf.Floor to pull the number down to a steady level, since I am using slanted blocks.

3

The problem may be that the hit point doesn’t come out exactly equal to 4, having some variation either way, and Floor amplifies the variation. You could try adding a small amount, e.g. 0.05, before calling Floor.