Isometric Dynamic Shadows

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Well here's a little effect using surfaces that I developed for a minigame of mine, and Chronic suggested I make a practical example. Now I know not too many people work in isometric (crying shame!) but the same technique could be applied to a top/front view like the typical old school RPGs.

This demonstrates shadows being cast onto isometric blocks from above. You probably have to see it to understand what I mean!

Move the ball with arrow keys.