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jPCT-AE - a 3d engine for Android => Support => Topic started by: mxar on December 05, 2018, 01:26:17 pm
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Hi,
I try to develop a Virtual Reality application using Google's Cardboard Java API.
Do you have any example?
I have a big problem adjusting JPCT's coordination system with Cardboard's Java API coordinate system.
I think the solution exists in the method
public void onDrawEye(Eye eye)
My code is:
@Override
public void onDrawEye(Eye eye) {
com.threed.jpct.Matrix camBack = world.getCamera().getBack();
camBack.setIdentity();
tempTransform.setDump(eye.getEyeView());
tempTransform.transformToGL();
camBack.matMul(tempTransform);
world.getCamera().setBack(camBack);
fb.clear(RGBColor.BLACK);
fb.clearZBufferOnly();
world.renderScene(fb);
world.draw(fb);
fb.display();
}
The Objects3D models added to the world don't look ok according to the XYZ positions a I have set.
I suppose the problem is because JPCT uses a different coordinate system than OpenGL.
Can you suggest a solution?
Thanks in advance
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Might be because the matrix from the cardboard API is a view matrix while jPCT's camera matrix is a rotation matrix. Have you looked at this example: http://www.jpct.net/wiki/index.php?title=Example_for_Google_Cardboard (http://www.jpct.net/wiki/index.php?title=Example_for_Google_Cardboard)?
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Many thanks!!!
Great example.
Also I have another question:
Primitives.getCube(scale) method, creates a cube rotated 45 degrees around Y axis?
Thanks in advance
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Yes. That's caused by the way in which these objects are build. I think ExtendedPrimitives does it differently.
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Many thanks!!! :)