public BubbleValue set(float x, float y, float z) {
        this.x = x;
        this.y = y;
        this.z = z;
        this.originX = x;
        this.originY = y;
        this.originZ = z;
        this.diffX = 0;
        this.diffY = 0;
        this.diffZ = 0;
        return this;
    }
Difference between originX value and target X value.
hellocharts-library/src/lecho/lib/hellocharts/model/BubbleValue.java