How to set Rendering Order in superposed surfaces

Troubleshooting General Help
1

Hi, I need help setting the render order. I have a completely flat TerrainBlock, and some Disks at the same Height. Jme sometimes shows the Terrain, sometimes de disk, and sometimes a mix of both (quite ugly).

Is there a way to tell JME which object to render last?



Thanks in advanced, Kanto.

2

Chances are, you're suffering from a Z fighting issue. If the difference between disk and terrain is jagged edges or a stipple pattern, then that's quite likely the cause. The only real solution is to lower (or raise) one of the geometries slightly.

3

Or you could use Renderer.setPolygonOffset() between drawing your Terrain and Disks.



public class NewMain extends SimpleGame{
   
    public static void main(String[] args) {
        new NewMain().start();
    }

    Disk disk = new Disk("d", 40, 40, 3f);
    Quad terrain = new Quad("q", 10f, 10f);
   
    @Override
    protected void simpleInitGame() {
        terrain.setSolidColor(ColorRGBA.brown);
        disk.setSolidColor(ColorRGBA.orange);
        //since terrain and disk are not attached to rootNode, we have to update all state information manually
        terrain.updateRenderState();
        disk.updateRenderState();
    }

    @Override
    protected void simpleRender() {
        Renderer r = display.getRenderer();
        r.draw(terrain);
        r.setPolygonOffset( 1f, 5f);
        r.draw(disk);
    }
}