Object rotation

[gamerfan]

Hi,
I was going through the CollisionDemoSoftware and trying to understand how it works.There I noticed one thing that the small cube has been placed on the plane.Here I need to rotate the small cube along X-axis to a certain degree.But when rotated the cube, the entire scene was away from the other objects along with small cube. (In fact, only the small cube is visible). What I want to achieve here is everything should be there as expected but the small cube should be rotated along x axis. This is the code I have used.
               

Code: [Select]

                cube = Primitives.getCube(2);
cube.translate(-50, -10, -50);
                cube.rotateX(SPEED);
                cube.rotateMesh();
                How to handle this? Thanks in advance.

[EgonOlsen]

That's because the camera aligns with the cube in this example and that cube still has a rotation in your modification. Add a call to cube.clearRotation(); after doing the rotateMesh().

[gamerfan]

Thanks, It worked !!!

[gamerfan]

sorry to ask one thing here. when we say clearRotation what exactly happens?

[EgonOlsen]

It sets the rotation matrix to the identity matrix. It's a shortcut to cube.getRotationMatrix().setIdentity();

[gamerfan]

I am further understanding this rotation and camera movement.This time I have added the code for moving the cube along Y-axis.And this is the following code I have added.But what happens is that the camera itself is moving up and the cube disappears.

Code: [Select]

if(keyA) {
                    SimpleVector t = cube.getYAxis();
    //t.scalarMul(SPEED);
    moveRes.add(t);
                    System.out.println(" keyA x " + moveRes.x+ " keyA y " + moveRes.y + " keyA z " + moveRes.z);
                    moveRes = cube.checkForCollisionEllipsoid(moveRes, ellipsoid, 8);
                    System.out.println(" x " + moveRes.x+ " y " + moveRes.y + " z " + moveRes.z);
                     if(moveRes.y < 0) {
                         System.out.println(" less than zer0....");
                         cube.translate(0, 0.25f, 0);
                     }   
                     else {
                        cube.translate(moveRes);
                     }
                   
                    cube.translateMesh();
                    cube.clearTranslation();
                }
I have added the above two lines. But the cube is not moving along y-axis, similarly the way it is moving along z-axis. Instead of that, the camera itself is moving up as I described earlier.