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    <p>I managed to solve my own issue and now it works properly. For anyone interested what I did was find the rectangle created by the overlap of the two bounding boxes of the two sprites. I then dropped each object to the origin along with it, relatively, the rectangle of intersection. It should be noted that I dropped each object to a "separate" origin - ie I effectively had two rectangle of intersection afterwards - one for each. The co-ordinates of each rectangle of intersection, now in bounds of the bitmask 2D arrays for both objects, were used to check the correct regions for overlap of both objects:</p> <p>I loop bottom to top left to right through the bitmask as the image data provided in upside - apparently this is the norm for image data.</p> <pre><code> /** * My Pixel level test - 2D * * @param rect the rectangle representing the intersection of the bounding * boxes * @param index1 the index at which the first objects texture is stored * @param index2 the index at which the second objects texture is stored * @param p1 the position of object 1 * @param p2 the position of object 2 * @return true if there is a collision at a pixel level false if not */ //public static boolean isPixelCollision(Rectangle2D rect, Point2D.Float p1, Bitmask bm1, Point2D.Float p2, Bitmask bm2) public static boolean isPixelCollision(Rectangle2D rect, Point2D.Float p1, int index1, Point2D.Float p2, int index2) { int height = (int) rect.getHeight(); int width = (int) rect.getWidth(); byte mask1 = 0; byte mask2 = 0; //drop both objects to the origin and drop a rectangle of intersection for each along with them //this allows for us to have the co-ords of the rect on intersection within them at number that are inbounds. Point2D.Float origP1 = new Point2D.Float((float) Math.abs(rect.getX() - p1.x), (float) Math.abs(rect.getY() - p1.y));//rect for object one Point2D.Float origP2 = new Point2D.Float((float) Math.abs(rect.getX() - p2.x), (float) Math.abs(rect.getY() - p2.y));//rect for object two //to avoid casting with every iteration int start1y = (int) origP1.y; int start1x = (int) origP1.x; int start2y = (int) origP2.y; int start2x = (int) origP2.x; //we need to loop within the rect of intersection //goind bottom up and left to right for (int i = height - 1; i &gt; 0; i--) { for (int j = 0; j &lt; width; j++) { mask1 = bitmaskArr[index1].bitmask[start1y + i][start1x + j]; mask2 = bitmaskArr[index2].bitmask[start2y + i][start2x + j]; if ((mask1 &amp; mask2) &gt; 0) { return true; } } } //no collsion was found return false; } </code></pre>
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