Terrain and Car

Troubleshooting physics
1

Hello,



I dont know if this has already been talked about in these forums but I could not find what I was looking for so I apologise in advance.



I have a uneven terrain wich is an OBJ which I import.







(marked in re is where the car drives, I want the car to follow the grey terrain.)



and I ahve my car which is also a OBJ which I import when the two colide its as through a box has been created around the highest point and the car just drives on a flat plane at the highest point rather than folloing the terrain.



Thanks


private void plane_level() {

        ObjToJme converter = new ObjToJme();
        try {
            URL objFile = Main.class.getClassLoader().getResource("level.obj");
            converter.setProperty("mtllib", objFile);
            converter.setProperty("texdir", objFile);
            ByteArrayOutputStream BO = new ByteArrayOutputStream();
            System.out.println("Starting to convert .obj to .jme");
            converter.convert(objFile.openStream(), BO);
            world = (TriMesh) BinaryImporter.getInstance().load(
                    new ByteArrayInputStream(BO.toByteArray()));

            world.setModelBound(new BoundingBox());
            world.updateModelBound();
            world.setLocalTranslation(0, -10, 0);

            MidPointHeightMap heightMap = new MidPointHeightMap(64, 1f);

            //set height maps
            ProceduralTextureGenerator pt = new ProceduralTextureGenerator(heightMap);
            pt.addTexture(new ImageIcon(Main.class.getClassLoader().getResource("B4NDIT2.jpg")), -128, 0, 128);
            pt.addTexture(new ImageIcon(Main.class.getClassLoader().getResource("B4NDIT2.jpg")), 0, 128, 255);
            pt.addTexture(new ImageIcon(Main.class.getClassLoader().getResource("B4NDIT2.jpg")), 128, 255, 384);
            pt.createTexture(32);

            // assign the texture to the terrain
            TextureState ts = display.getRenderer().createTextureState();
            Texture t1 = TextureManager.loadTexture(pt.getImageIcon().getImage(),
                    Texture.MM_LINEAR_LINEAR, Texture.FM_LINEAR, true);
            ts.setTexture(t1, 0);
            world.setRenderState(ts);

            final StaticPhysicsNode staticNode = getPhysicsSpace().createStaticNode();
            //Box world;
            //world = new Box("world", new Vector3f(0, -1, 0), 50f, .2f, 50f);
            MaterialState redgreen = display.getRenderer().createMaterialState();
            redgreen.setDiffuse(ColorRGBA.red);
            redgreen.setShininess(10f);
            world.setRenderState(redgreen);
            staticNode.attachChild(world);
            staticNode.generatePhysicsGeometry();
            staticNode.setMaterial(Material.CONCRETE);
            rootNode.attachChild(staticNode);

        } catch (Exception e) {
        }

    }

2

try to use triangle accuracy for collision detection with generatePhysicsGeometry(true).

generatePhysicsGeometry() only works for basic shapes, where its boundingbox fits the shape more or less exactly.



Or you can try to make a physical copy of the terrain.



instead of:

node.generatePhysicsGeometry();


use:


          PhysicsMesh mesh = node.createMesh("physics mesh");
          mesh.copyFrom(visual);
          node.attachChild(mesh);



i'm not sure whats the preferred way :)
3

Cheers working now. Thought the thrid person camera is juddering when the car acelerates