I tried without normalize still I get same result.

Hello,

I am do some 2D drawing in bottom of the screen so trying to convert the 2D position into 3D using reproject2D3DWS method and doing some calculations and converting back into 2D using project3D2D method. But I always get the returned 2D values around the middle of the screen.

here is a sample code to reproduce it.

System.out.println("X:"+e.getX() +",Y:"+e.getY());
      SimpleVector v = Interact2D.reproject2D3DWS(jpctPanel.getWorld().getCamera(), jpctPanel.getBuffer(),
            e.getX(), e.getY()).normalize();
      System.out.println(Interact2D.project3D2D(jpctPanel.getCamera(), jpctPanel.getBuffer(), v));

Mouse coord: X:420,Y:458
Output of above code: (904.2925,487.36615,0.0047869836)

X:1480,Y:402
(909.04944,487.11993,0.0047874274)

any help.

Thanks.

I tried it but no luck. I tried to set the setCenterOfMassTransform of the RigidBody to 0 still no luck. It is just 3 unit difference in Y axis when I add it manually it messes up for other shapes.

Thanks Egon. Got it working now. There were two mistakes
1. Wrong indices
2. Wrong vertex length passed to the TriangleIndexVertexArray Constructor. (Reason for the IndexOutofBoundException).

final code:
private ByteBuffer createIndexBuffer() {
setvController(new VertexController(object3D));

ByteBuffer indexBuffer = BufferUtils.createByteBuffer(object3D.getMesh().getVertexCount() * 4).order(ByteOrder.nativeOrder());
indexBuffer.clear();

PolygonManager pMgr = object3D.getPolygonManager();
SimpleVector vertices[] = vController.getSourceMesh();
SimpleVector vertex;
int index = 0;
for (int i=0; i<pMgr.getMaxPolygonID(); i++) {
vertex = null;
for(int vertexNumber=0; vertexNumber<3; vertexNumber++) {
vertex = pMgr.getTransformedVertex(i, vertexNumber);
index = 0;
for(SimpleVector sourceVertex : vertices){
if(sourceVertex.equals(vertex)) {
indexBuffer.putInt(index);
break;
}
index++;
}
vertexNumber++;
}
}
return indexBuffer;
}

private static TriangleIndexVertexArray createIndexVertexArray(Object3D obj) {
RigidObject ro = RigidObjectManager.getInstance().getRigidObject(obj.getName());


int numTriangles = obj.getMesh().getTriangleCount();
int numVertices = obj.getMesh().getVertexCount();

ByteBuffer indexBuffer = ro.getIndexBuffer();

ByteBuffer vertexBuffer = BufferUtils.createByteBuffer(numVertices * 4).order(ByteOrder.nativeOrder());
vertexBuffer.clear();

SimpleVector[] vertices = ro.getvController().getSourceMesh();
for (int i = 0; i < vertices.length; i++) {
vertexBuffer.putFloat(vertices[i].x);
vertexBuffer.putFloat(vertices[i].y);
vertexBuffer.putFloat(vertices[i].z);
}
vertexBuffer.rewind();
indexBuffer.rewind();

TriangleIndexVertexArray vertexArray = new TriangleIndexVertexArray(numTriangles, indexBuffer, 3*4, vertices.length, vertexBuffer, 3*4);
return vertexArray;
}

Hello,

I am trying to create a TriangleIndexVertexArray Object from Object3D for GImpactMeshShape (JBullet intergration). How do I get the IndexBuffer? The below code works for BvhTriangleMeshShape but GImpactMeshShape  throws IndexOutOfBoundsException. calculating the indexBuffer is the problem. Please help.

private static TriangleIndexVertexArray createIndexVertexArray(Object3D obj) {
RigidObject ro = RigidObjectManager.getInstance().getRigidObject(obj.getName());

int numTriangles = obj.getMesh().getTriangleCount();
int numVertices = obj.getMesh().getVertexCount();
// int numVertices = obj.getMesh().getUniqueVertexCount();
//4 represents Byte size of Integer
ByteBuffer indexBuffer = BufferUtils.createByteBuffer(numVertices * 4).order(ByteOrder.nativeOrder());
for (int i=0; i<numTriangles; i++) {

indexBuffer.putInt(i);
indexBuffer.putInt(i);
indexBuffer.putInt(i);
}

ByteBuffer vertexBuffer = BufferUtils.createByteBuffer(numVertices * 4).order(ByteOrder.nativeOrder());
vertexBuffer.clear();

SimpleVector[] vertices = ro.getvController().getSourceMesh();
for (int i = 0; i < vertices.length; i++) {
vertexBuffer.putFloat(vertices[i].x);
vertexBuffer.putFloat(vertices[i].y);
vertexBuffer.putFloat(vertices[i].z);
}
vertexBuffer.rewind();
indexBuffer.rewind();

TriangleIndexVertexArray vertexArray = new TriangleIndexVertexArray(numTriangles, indexBuffer, 3*4, obj.getMesh().getVertexCount(), vertexBuffer, 3*4);
return vertexArray;
}
Thanks.

Thanks for the quick reply it works. Didn't know subtracting the two vectors gives the direction. Where can I learn such things? any recommendation?

Thanks.