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XNA 3.0 Game Programming Recipes: A Problem-Solution Approach
book

XNA 3.0 Game Programming Recipes: A Problem-Solution Approach

by Riemer Grootjans
May 2009
Intermediate to advanced content levelIntermediate to advanced
671 pages
18h 34m
English
Apress
Content preview from XNA 3.0 Game Programming Recipes: A Problem-Solution Approach
CHAPTER 5 ■ GETTING THE MOST OUT OF VERTICES
457
private Ray LinearSearch(Ray ray)
{
ray.Direction /= 300.0f;
Vector3 nextPoint = ray.Position + ray.Direction;
float heightAtNextPoint = terrain.GetExactHeightAt(nextPoint.X, -nextPoint.Z);
while (heightAtNextPoint < nextPoint.Y)
{
ray.Position = nextPoint;
nextPoint = ray.Position + ray.Direction;
heightAtNextPoint = terrain.GetExactHeightAt(nextPoint.X, -nextPoint.Z);
}
return ray;
}
In this example, the Ray is divided into no less than 300 steps. Increasing this value will
increase the probability of detecting peaks but will require more processing power.
For each point, you calculate the next point and check whether that next point is above or
below the terrain. As long as it is above the ...
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Publisher Resources

ISBN: 9781430218555Purchase Link