XNA prevent往下走斜坡或向上过于陡峭的山峰 [英] xna prevent to go down slopes or up hills that are too steep

问题描述

我怎么能prevent往下走斜坡或最多是在高度图地形过于陡峭的山峰？ 我有一个3D摄像头，对地形移动，现在在移动甚至在大斜坡和过于陡峭的山坡任何地方，我该怎么办？

how can i prevent to go down slopes or up hills that are too steep on heightmap terrain? I have a 3d camera that moves on a terrain, it now moves on any place even on big slopes and on hills that are too steep, what can I do?

推荐答案

我会避免上升/运行Calcs（计算），因为它们可能会产生一个NaN的，如果地形是垂直的。

I would avoid rise/run calcs as they could produce a NaN if terrain is vertical.

//currentPosition & targetPosition should be known to you

Vector3 potentialMove = Vector3.Normalize(targetPosition - currentPosition);

float steepness = Vector3.Dot(Vector3.Up, potentialMove);
if( steepness < 0.85f && steepness > -0.85f) // set to taste. 1 is vertically up, 0 is flat, -1 is vert down
{
  //allow move
  currentPosition = targetPosition
}

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