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For this tutorial we only require unobstructed space preprocess, for collision queries, and do not require pathfinding, so we'll use just generateUnobstructedSpaceFor().
In addition to the previously created shape, there are a couple of other parameters to this method.
The second parameter determines whether boundaries in the unobstructed space preprocess are combined into a single boundary representation. We'll set this to false, for fastest possible preprocess generation, and because we don't need to subsequently generate pathfinding preprocess.
The final parameter enables a set of arbitrary attributes to be passed in to control
aspects of process generation.
In this case we simply pass a null pointer to indicate no attributes, since we just want the default preprocess generation behaviour.
mesh->generateUnobstructedSpaceFor(*agent_shape, false, 0);
The preprocess generated by this call includes a minkowski
expansion of the external edges of the mesh by the shape specified.
PathEngine collision is implemented in terms of collision of the agent origin against these expanded boundaries.
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