# How can I get the ground slope angle from a physx character controller?

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I need to get the slope angle of the ground below my character controller but I can't think of how this would be done?

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If you have the normal, you can get the angle as follows (untested):

angle = acos(clamp(normal.z, -1, 1));
If +z is not up, adjust accordingly (for example, for +y up, you'd use normal.y).

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If you have the normal, you can get the angle as follows (untested):

angle = acos(clamp(normal.z, -1, 1));
If +z is not up, adjust accordingly (for example, for +y up, you'd use normal.y).

Well that is part of what I need but I also need to actually get the triangle from PhysX.

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I just realized I can use the NxUserControllerHitReport to get a normal. This gets a normal that is facing outward from a triangle. I am trying to cause the controller to slide down slopes that are too steep. So, from that I need to get a normal that is parallel to that normal and always facing down.

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So, from that I need to get a normal that is parallel to that normal and always facing down.

I'm not completely sure what you mean by that. Can you clarify?

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[quote name='SteveDeFacto' timestamp='1299783734' post='4784095']
So, from that I need to get a normal that is parallel to that normal and always facing down.

I'm not completely sure what you mean by that. Can you clarify?
[/quote]

Yeah, reading that again even confused me. I'm actually not sure how to explain what I was saying but it was unnecessary anyway. I figured if I pushed the controller directly away from the face it would cause it to bounce off the slope, fall back on, bounce off again, and continue to do it until it reached a surface below it's slope limit. I thought this would cause jittering but I was wrong and the controller actually glides over the surface perfectly. Everything is working perfect now and I didn't even have to create a custom controller class like the physx forum mods said I would!

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