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Question

I am writing a java Game Engine for OpenGL using LWJGL and OpenGL 3.2. Whenever the mouse is moved to rotate the camera it adds roll as well as pitch and yaw.

Camera code

public Matrix4f getViewMatrix() {
    getParent().getTransform().getWorldRot().mul(rotation, (Quaternion) null).toRotationMatrix(viewMatrix);
    viewMatrix.mul(Matrix4f.setTranslation(getParent().getTransform().getWorldPos(), null));
    return viewMatrix;
}


public boolean mouseMoved(MouseEvent event) {
    Quaternion.mul(rotation, new Quaternion((float) Math.toRadians(event.x / 1f), rotation.getUp(null)), rotation);
    Quaternion.mul(rotation, new Quaternion((float) Math.toRadians(event.y / 1f), rotation.getRight(null)), rotation);
    return true;
}

Quaternion code

public Vector4f getRight(Vector4f dest) {
    if (dest == null)
        dest = new Vector4f();

    dest.x = 1.0f - 2.0f * (y * y + z * z);
    dest.y = 2.0f * (x * y - w * z);
    dest.z = 2.0f * (x * z + w * y);

    return dest;
}

public Vector4f getUp(Vector4f dest) {
    if (dest == null)
        dest = new Vector4f();

    dest.x = 2.0f * (x * y + w * z);
    dest.y = 1.0f - 2.0f * (x * x + z * z);
    dest.z = 2.0f * (y * z - w * x);

    return dest;
}

public Vector4f getForward(Vector4f dest) {
    if (dest == null)
        dest = new Vector4f();

    dest.x = 2.0f * (x * z - w * y);
    dest.y = 2.0f * (y * z + w * x);
    dest.z = 1.0f - 2.0f * (x * x + y * y);

    return dest;
}

Answer 1

I don't need to get the up.

public boolean mouseMoved(MouseEvent event) {
    Quaternion.mul(rotation, new Quaternion((float) Math.toRadians(event.x / 1f), Vector4f.UP), rotation);
    Quaternion.mul(rotation, new Quaternion((float) Math.toRadians(event.y / 1f), rotation.getRight(null)), rotation);
    return true;
}