public ObiHeightFieldHandle GetOrCreateHeightField(TerrainData source)
{
ObiHeightFieldHandle handle;
if (!handles.TryGetValue(source, out handle))
{
// Get the heighfield into a 1d array:
int width = source.heightmapResolution;
int height = source.heightmapResolution;
float[,] heights = source.GetHeights(0, 0, width, height);
float[] buffer = new float[width * height];
for (int y = 0; y < height; ++y)
{
for (int x = 0; x < width; ++x)
{
buffer[y * width + x] = heights[y, x];
}
}
handle = new ObiHeightFieldHandle(source, headers.count);
handles.Add(source, handle);
headers.Add(new HeightFieldHeader(samples.count, buffer.Length));
samples.AddRange(buffer);
}
return(handle);
}
public override bool UpdateIfNeeded()
{
TerrainCollider terrain = collider as TerrainCollider;
// retrieve collision world and index:
var world = ObiColliderWorld.GetInstance();
int index = source.Handle.index;
int resolution = terrain.terrainData.heightmapResolution;
// get or create the heightfield:
if (handle == null || !handle.isValid)
{
handle = world.GetOrCreateHeightField(terrain.terrainData);
handle.Reference();
}
// update collider:
var shape = world.colliderShapes[index];
shape.type = ColliderShape.ShapeType.Heightmap;
shape.phase = source.Phase;
shape.flags = terrain.isTrigger ? 1 : 0;
shape.rigidbodyIndex = source.Rigidbody != null ? source.Rigidbody.handle.index : -1;
shape.materialIndex = source.CollisionMaterial != null ? source.CollisionMaterial.handle.index : -1;
shape.contactOffset = terrain.contactOffset + source.Thickness;
shape.dataIndex = handle.index;
shape.size = terrain.terrainData.size;
shape.center = new Vector4(resolution, resolution, resolution, resolution);
world.colliderShapes[index] = shape;
// update bounds:
var aabb = world.colliderAabbs[index];
aabb.FromBounds(terrain.bounds, shape.contactOffset);
world.colliderAabbs[index] = aabb;
// update transform:
var trfm = world.colliderTransforms[index];
trfm.FromTransform(terrain.transform);
world.colliderTransforms[index] = trfm;
return(true);
}
public void DestroyHeightField(ObiHeightFieldHandle handle)
{
if (handle != null && handle.isValid && handle.index < handles.Count)
{
var header = headers[handle.index];
// Update headers:
for (int i = 0; i < headers.count; ++i)
{
var h = headers[i];
if (h.firstSample > header.firstSample)
{
h.firstSample -= header.sampleCount;
headers[i] = h;
}
}
// update handles:
foreach (var pair in handles)
{
if (pair.Value.index > handle.index)
{
pair.Value.index--;
}
}
// Remove nodes
samples.RemoveRange(header.firstSample, header.sampleCount);
// remove header:
headers.RemoveAt(handle.index);
// remove the heightfield from the dictionary:
handles.Remove(handle.owner);
// Invalidate our handle:
handle.Invalidate();
}
}
public void DestroyHeightField(ObiHeightFieldHandle hfHandle)
{
heightFieldContainer.DestroyHeightField(hfHandle);
}