/// <summary>
/// Build up renderable geometry from input height neighborhood and material map.
/// </summary>
/// <param name="neighbors"></param>
/// <param name="colorMap"></param>
/// <returns></returns>
public bool MakeGeometry(VirtualMap.HeightMapNeighbors heightNeighbors, VirtualMap.ColorMapNeighbors colorNeighbors)
{
MakeMinLut(heightNeighbors);
bool notEmpty = MakeRenderables(heightNeighbors, colorNeighbors);
CheckIndices(heightNeighbors[(int)VirtualMap.HeightMapNeighbors.Dir.Center].Size);
return(notEmpty);
}
/// <summary>
/// Build up renderable geometry for each possible material. Discard empties.
/// </summary>
/// <param name="neighbors"></param>
/// <param name="colorMap"></param>
/// <returns></returns>
private bool MakeRenderables(
VirtualMap.HeightMapNeighbors heightNeighbors,
VirtualMap.ColorMapNeighbors colorNeighbors)
{
var heightMap = heightNeighbors[VirtualMap.HeightMapNeighbors.Dir.Center];
VirtualMap.ColorMap colorMap = colorNeighbors[VirtualMap.ColorMapNeighbors.Dir.Center];
Renderable.PrepareToBuild(heightMap.Size, Min, minLut);
//Dispose();
//renderableDict.Clear();
// Reset number of local vertices in each Renderable
// since we're about to remake the list.
ResetAllVertexCounts();
Vector2 cubeSize = new Vector2(
heightMap.Scale.X / (float)heightMap.Size.X,
heightMap.Scale.Y / (float)heightMap.Size.Y);
Vector2 halfSize = cubeSize * 0.5f;
Point vert = new Point(0, 0);
for (vert.X = 0; vert.X < heightMap.Size.X; vert.X += 1)
{
for (vert.Y = 0; vert.Y < heightMap.Size.Y; vert.Y += 1)
{
float h = heightMap.GetHeightUnsafe(vert.X, vert.Y);
if (h != 0)
{
ushort color = colorMap[vert.X, vert.Y];
//Debug.Assert(TerrainMaterial.IsValid(color, false, true));
if (TerrainMaterial.IsValid(color, false, true))
{
Vector3 pos = new Vector3(
(float)vert.X * cubeSize.X + halfSize.X,
(float)vert.Y * cubeSize.Y + halfSize.Y,
h);
Renderable r = GetOrMakeRenderable(colorMap[vert.X, vert.Y]);
r.AddVertices(pos, halfSize, vert, heightNeighbors, colorNeighbors);
}
}
}
}
return(FinishGeometry(cubeSize, halfSize));
}
/// <summary>
/// Generate the minumum lookup table from the height neighborhood.
/// </summary>
/// <param name="neighbors"></param>
private void MakeMinLut(VirtualMap.HeightMapNeighbors neighbors)
{
HeightMap heightMap = neighbors[VirtualMap.HeightMapNeighbors.Dir.Center];
if ((minLut == null) || (minLutSize.X != heightMap.Size.X + 1) || (minLutSize.Y != heightMap.Size.Y + 1))
{
minLutSize = new Point(heightMap.Size.X + 1, heightMap.Size.Y + 1);
minLut = new Vector2[minLutSize.X, minLutSize.Y];
}
float absMax = heightMap.Scale.Z;
float absMin = 0.0f;
for (int j = 0; j < minLutSize.Y; ++j)
{
for (int i = 0; i < minLutSize.X; ++i)
{
minLut[i, j].X = absMax;
minLut[i, j].Y = absMin;
}
}
Debug.Assert(heightMap.Size.X == heightMap.Size.Y);
int lastPix = heightMap.Size.X - 1;
int lastLut = lastPix + 1;
/// Prime the sides from the neighbors.
HeightMap north = neighbors[VirtualMap.HeightMapNeighbors.Dir.North];
if (north != null)
{
for (int i = 0; i <= lastPix; ++i)
{
float height = north.GetHeight(i, 0);
minLut[i, lastLut].X = Math.Min(minLut[i, lastLut].X, height);
minLut[i + 1, lastLut].X = Math.Min(minLut[i + 1, lastLut].X, height);
minLut[i, lastLut].Y = Math.Max(minLut[i, lastLut].Y, height);
minLut[i + 1, lastLut].Y = Math.Max(minLut[i + 1, lastLut].Y, height);
}
}
else
{
for (int i = 0; i < minLutSize.X; ++i)
{
minLut[i, lastLut].X = absMin;
minLut[i, lastLut].Y = absMin;
}
}
HeightMap east = neighbors[VirtualMap.HeightMapNeighbors.Dir.East];
if (east != null)
{
for (int j = 0; j <= lastPix; ++j)
{
float height = east.GetHeight(0, j);
minLut[lastLut, j].X = Math.Min(minLut[lastLut, j].X, height);
minLut[lastLut, j + 1].X = Math.Min(minLut[lastLut, j + 1].X, height);
minLut[lastLut, j].Y = Math.Max(minLut[lastLut, j].Y, height);
minLut[lastLut, j + 1].Y = Math.Max(minLut[lastLut, j + 1].Y, height);
}
}
else
{
for (int j = 0; j < minLutSize.Y; ++j)
{
minLut[lastLut, j].X = absMin;
minLut[lastLut, j].Y = absMin;
}
}
HeightMap south = neighbors[VirtualMap.HeightMapNeighbors.Dir.South];
if (south != null)
{
for (int i = 0; i <= lastPix; ++i)
{
float height = south.GetHeight(i, lastPix);
minLut[i, 0].X = Math.Min(minLut[i, 0].X, height);
minLut[i + 1, 0].X = Math.Min(minLut[i + 1, 0].X, height);
minLut[i, 0].Y = Math.Max(minLut[i, 0].Y, height);
minLut[i + 1, 0].Y = Math.Max(minLut[i + 1, 0].Y, height);
}
}
else
{
for (int i = 0; i < minLutSize.X; ++i)
{
minLut[i, 0].X = absMin;
minLut[i, 0].Y = absMin;
}
}
HeightMap west = neighbors[VirtualMap.HeightMapNeighbors.Dir.West];
if (west != null)
{
for (int j = 0; j <= lastPix; ++j)
{
float height = west.GetHeight(lastPix, j);
minLut[0, j].X = Math.Min(minLut[0, j].X, height);
minLut[0, j + 1].X = Math.Min(minLut[0, j + 1].X, height);
minLut[0, j].Y = Math.Max(minLut[0, j].Y, height);
minLut[0, j + 1].Y = Math.Max(minLut[0, j + 1].Y, height);
}
}
else
{
for (int j = 0; j < minLutSize.Y; ++j)
{
minLut[0, j].X = absMin;
minLut[0, j].Y = absMin;
}
}
for (int i = 0; i < heightMap.Size.X; ++i)
{
for (int j = 0; j < heightMap.Size.Y; ++j)
{
float height = heightMap.GetHeight(i, j);
minLut[i, j].X = Math.Min(minLut[i, j].X, height);
minLut[i + 1, j].X = Math.Min(minLut[i + 1, j].X, height);
minLut[i, j + 1].X = Math.Min(minLut[i, j + 1].X, height);
minLut[i + 1, j + 1].X = Math.Min(minLut[i + 1, j + 1].X, height);
minLut[i, j].Y = Math.Max(minLut[i, j].Y, height);
minLut[i + 1, j].Y = Math.Max(minLut[i + 1, j].Y, height);
minLut[i, j + 1].Y = Math.Max(minLut[i, j + 1].Y, height);
minLut[i + 1, j + 1].Y = Math.Max(minLut[i + 1, j + 1].Y, height);
}
}
}