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    <p>Shadow mapping assumes either a directional light, or a spotlight, and you have a point light. But since you only need shadow on the floor, you could model it as a spotlight that hovers e.g. 2 m above the floor and points downwards. All the walls would have to be at least 2 m high. In the first shadow mapping pass, you could render the floor and all the walls into the shadow buffer.</p> <p>However, I would not go with shadow mapping, but use volumetric shadows instead. If you go from 3D to 2D, a 3D volume becomes a 2D polygon.</p> <p>Assuming that all the walls are on a regular grid, we can compute view rays from the player's position P to all the corners of walls. For each corner, store the adjacent walls, and ignore all the walls that face away from the player. Then cast rays from P to each corner, convert the rays to polar coordinates, and sort them by their angle, say counter-clockwise. Now go through this sorted list in a sweeping motion, and build the shadow polygon.</p> <p>The shadow polygon consists either of corner points in this list, or of intersections between a) a line that is parallel to a wall and b) a line that goes through P and a corner. The only thing that makes this a bit complicated is that you have to find the wall that receives the shadow. Since the input is so small, I would probably start with brute force (check the corner against each wall), and see how slow it is. Note that only player-facing walls can cast shadows. Also note that the point closest to the player doesn't need to be visible.</p> <p>It's probably going to look really cool with a moving character.</p>
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    1. PO2d shadow mapping
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    1. USAndreas Haferburg
    1. USAndreas Haferburg
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