Is there a better way to tilt terrain at runtime?

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1

I’m using this code to tilt my terrain at runtime. It works pretty well except it’s very slow. It has to iterate through each height point so it ends up taking 2-3 seconds. I’d love to find a way to shave even a little bit of time off.

function OnGUI ()
{
	if (GUI.Button(Rect(200,10,50,30), "tilt"))
	{
	    SlopeAngle (0.1);
    }
}

function SlopeAngle (change : float)
{
	var tData = terrain.GetHeights(0, 0, terrain.heightmapWidth, terrain.heightmapHeight);

    // iterate through height points
	for (i = 0; i < terrain.heightmapHeight; i++)
	{
	    for (j = 0; j < terrain.heightmapWidth; j++)
	    {
            // lowers terrain points at end, gradually decreasing to 0 as it reaches end
	        tData[i, j] -= ((change / terrain.heightmapWidth) * j);
	    }
	}
	terrain.SetHeights(0, 0, tData);
}

1 Answer

1
2

I feel stupid. I had a Debug.Log line in there that was making it run super slow. I took it out and it’s all good now.

Not sure if it changes much but I also changed
tData[i, j] -= ((change / terrain.heightmapWidth) * j);
to this
tData[i, j] -= gradHeight * j;
and put this just before the loop
var gradHeight : float = change / terrain.heightmapWidth;