Adding obstacles under slopes

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Matt Lewis

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Nov 3, 2012, 11:56:26 AM11/3/12

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Hi, I currently have a problem when I add obstacles to the dtTileCache (using addObstacle). Before I add the obstacle I increase the size of the bounding volume by the size of the walkable radius, I do this because the obstacles don’t erode the walkable area and I need to be able to navigate around them. The problem comes if an obstacle is placed underneath a slope. Without the obstacle the slope is normally navigable (it’s the right size and below the max slope angle). However when I place an obstacle underneath it I can no longer find a path up it, this is because I’ve increased the size obstacle to allow for the walkable radius and it punches through the slope.

\ slope

_____ \

Obstacle | | \

| | \

|_____| \

_______ \___

| \ | Increased size for walkable area

| \ |

|_________\|

Does anyone know if there is a way around this? It looks like I need the obstacles to actually erode the walkable area so it takes into account solid objects near by, but I’m not sure if this is possible or would take up too much cpu time (the obstacle system seems to be pretty streamlined and efficient).