xna 防止下坡或上坡太陡

问题描述

如何防止在高度图地形上下坡或上坡太陡?我有一个可以在地形上移动的 3d 相机，现在它可以在任何地方移动，即使是在大斜坡和太陡的山坡上，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/运行计算，因为如果地形是垂直的，它们可能会产生 NaN.

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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