Ray collision with terrain -> CastError (jME3 Bug)

Troubleshooting terramonkey
1

Hi folks,



I’m continuing on my Total War terrain quest :stuck_out_tongue: and encountered an error while picking the terrain.

I’ve got this picking code in my onAction() method:

[java]

if (name.equals(“mouse_left”) && !pressed) {

CollisionResults results = new CollisionResults();

Ray ray = new Ray(cam.getLocation(), cam.getDirection());

map.terrain.collideWith(ray, results); // <- Exception is here

for (int i = 0; i < results.size(); i++) {

Vector3f pt = results.getCollision(i).getContactPoint();

map.selectTile((int) pt.x, (int) pt.z);

}

}

[/java]



All the data is set up and I see the terrain. When I click on the terrain, I got the following error:

[java]

SCHWERWIEGEND: Uncaught exception thrown in Thread[LWJGL Renderer Thread,5,main]

java.lang.ClassCastException: com.jme3.scene.Geometry cannot be cast to com.jme3.terrain.geomipmap.TerrainQuad

at com.jme3.terrain.geomipmap.TerrainQuad.findPick(TerrainQuad.java:1418)

at com.jme3.terrain.geomipmap.picking.BresenhamTerrainPicker.getTerrainIntersection(BresenhamTerrainPicker.java:78)

at com.jme3.terrain.geomipmap.TerrainQuad.collideWithRay(TerrainQuad.java:269)

at com.jme3.terrain.geomipmap.TerrainQuad.collideWith(TerrainQuad.java:1382)

at openwar.Main$1$1.onAction(Main.java:55)

[/java]

2

Did you maybe attach other Geometry to the terrain? I think you should not do that as the Terrain expects only terrain quads as children.

3

Argh… that’s it. I had the skybox in my terrain node, duh. Thanks, normen! :slight_smile:



But maybe this use case could be changed in the core code so that it doesn’t happen to others aswell?

4

Yeah, guess there should be at least some warning or something.