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3D angle Problem

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fantasyme    100
Problem is when AI change direction, the face of AI won't face to the proper direction. I use this function to move model's face.

this function for movement.
g_Mesh.vPos.x += sin(angleX)*speed;
g_Mesh.vPos.z += cos(angleZ)*speed;

How can I apply angleX and angleY to be one single value for AI to rotate its face to the way where it gonna go? In directX has some function can help?? thanks

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