Cube placing on edges of cubes

Unity Engine
1

Hey,

For a game i make i currently work on a building mechanic. i’ve got everything working just fine, just one little thing i cant figure out how to avoid.

The problem is, if you loot at the edge of a cube you placed you will place a cube that is floating in the air without beeing “connected” to another cube.

here an image for better understanding:

641×611 98.4 KB

here is the code that is responsible for the cube placement:

if (Physics.Raycast(ray, out raycasthit, placeRange))
{
    if (raycasthit.transform.gameObject.tag == "Block" || raycasthit.transform.gameObject.tag == "Ground")
    {
        if (mode == 0)
        {
            Vector3 hitpoint = ray.GetPoint(raycasthit.distance - 0.2f);

            float ypos = ((hitpoint.y % 1 != 0) ? Mathf.FloorToInt(hitpoint.y) : hitpoint.y) + 0.5f;

            Vector3 placeAt = new Vector3(Mathf.RoundToInt(hitpoint.x), ypos, Mathf.RoundToInt(hitpoint.z));
            blockPlaceholder.transform.position = placeAt;
            blockPlaceholder.SetActive(true);
        }
    }
}

if (Input.GetMouseButtonDown(0))
{
    if(mode == 0)
    {
        GameObject newblock = Instantiate(block, blockPlaceholder.transform.position, Quaternion.Euler(Vector3.zero));
    }
}

Ignore the “mode”. This is a very cutdown version of the script since there is a lot of other stuff in there too.

i include the whole package too so you can test it out and change stuff easier.

would love to get some ideas on how to avoid this.

4330009–390463–blockplacingtest.unitypackage (360 KB)

2

Raycast down from the cube you’re about to place by 1 cube length distance and if there’s nothing there, don’t place the original cube?