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Account for ramps in terrain height calculations.

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This commit is contained in:
Paul Chote
2020-05-04 00:25:14 +01:00
committed by atlimit8
parent 5af12440ba
commit 626b40f31b
6 changed files with 48 additions and 17 deletions
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14
OpenRA.Game/Map/MapGrid.cs
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@@ -24,6 +24,7 @@ namespace OpenRA
public struct CellRamp
{
public readonly int CenterHeightOffset;
public readonly WVec[] Corners;
public readonly WVec[][] Polygons;
@@ -68,9 +69,13 @@ namespace OpenRA
}
else
Polygons = new[] { Corners };
// Initial value must be asigned before HeightOffset can be called
CenterHeightOffset = 0;
CenterHeightOffset = HeightOffset(0, 0);
}
public WDist DistanceAboveTerrain(WVec delta)
public int HeightOffset(int dX, int dY)
{
// Enumerate over the polygons, assuming that they are triangles
// If the ramp is not split we will take the first three vertices of the corners as a valid triangle
@@ -80,8 +85,8 @@ namespace OpenRA
for (var i = 0; i < Polygons.Length; i++)
{
p = Polygons[i];
u = ((p[1].Y - p[2].Y) * (delta.X - p[2].X) - (p[1].X - p[2].X) * (delta.Y - p[2].Y)) / 1024;
v = ((p[0].X - p[2].X) * (delta.Y - p[2].Y) - (p[0].Y - p[2].Y) * (delta.X - p[2].X)) / 1024;
u = ((p[1].Y - p[2].Y) * (dX - p[2].X) - (p[1].X - p[2].X) * (dY - p[2].Y)) / 1024;
v = ((p[0].X - p[2].X) * (dY - p[2].Y) - (p[0].Y - p[2].Y) * (dX - p[2].X)) / 1024;
// Point is within the triangle if 0 <= u,v <= 1024
if (u >= 0 && u <= 1024 && v >= 0 && v <= 1024)
@@ -89,8 +94,7 @@ namespace OpenRA
}
// Calculate w from u,v and interpolate height
var dz = (u * p[0].Z + v * p[1].Z + (1024 - u - v) * p[2].Z) / 1024;
return new WDist(delta.Z - dz);
return (u * p[0].Z + v * p[1].Z + (1024 - u - v) * p[2].Z) / 1024;
}
}