pan

calculatePanning.java

private float calculatePanning(Vector3 position) {
        if (camera != null) {
            tmp.set(camera.up);
            tmp.crs(camera.direction);
            tmp.nor();
            final float lenX = camera.position.x - position.x;
            final float lenY = camera.position.y - position.y;
            final float lenZ = camera.position.z - position.z;
            final float clampX = tmp.dot(new Vector3(lenX, lenY, lenZ));
            return MathUtils.clamp(clampX / MAX_PAN_DISTANCE, -1f, 1f);
        } else {
            return 0f;
        }
    }