// Convert the passed heightmap to mesh information suitable for CreateMeshShape2().
// Version that handles magnification.
// Return 'true' if successfully created.
public static bool ConvertHeightmapToMesh2( BSScene physicsScene,
float[] heightMap, int sizeX, int sizeY, // parameters of incoming heightmap
int magnification, // number of vertices per heighmap step
Vector3 extent, // dimensions of the output mesh
Vector3 extentBase, // base to be added to all vertices
out int indicesCountO, out int[] indicesO,
out int verticesCountO, out float[] verticesO)
{
bool ret = false;
int indicesCount = 0;
int verticesCount = 0;
int[] indices = new int[0];
float[] vertices = new float[0];
HeightMapGetter hmap = new HeightMapGetter(heightMap, sizeX, sizeY);
// The vertices dimension of the output mesh
int meshX = sizeX * magnification;
int meshY = sizeY * magnification;
// The output size of one mesh step
float meshXStep = extent.X / meshX;
float meshYStep = extent.Y / meshY;
// Create an array of vertices that is meshX+1 by meshY+1 (note the loop
// from zero to <= meshX). The triangle indices are then generated as two triangles
// per heightmap point. There are meshX by meshY of these squares. The extra row and
// column of vertices are used to complete the triangles of the last row and column
// of the heightmap.
try
{
// Vertices for the output heightmap plus one on the side and bottom to complete triangles
int totalVertices = (meshX + 1) * (meshY + 1);
vertices = new float[totalVertices * 3];
int totalIndices = meshX * meshY * 6;
indices = new int[totalIndices];
if (physicsScene != null)
physicsScene.DetailLog("{0},BSTerrainMesh.ConvertHeightMapToMesh2,inSize={1},outSize={2},totVert={3},totInd={4},extentBase={5}",
BSScene.DetailLogZero, new Vector2(sizeX, sizeY), new Vector2(meshX, meshY),
totalVertices, totalIndices, extentBase);
float minHeight = float.MaxValue;
// Note that sizeX+1 vertices are created since there is land between this and the next region.
// Loop through the output vertices and compute the mediun height in between the input vertices
for (int yy = 0; yy <= meshY; yy++)
{
for (int xx = 0; xx <= meshX; xx++) // Hint: the "<=" means we go around sizeX + 1 times
{
float offsetY = (float)yy * (float)sizeY / (float)meshY; // The Y that is closest to the mesh point
int stepY = (int)offsetY;
float fractionalY = offsetY - (float)stepY;
float offsetX = (float)xx * (float)sizeX / (float)meshX; // The X that is closest to the mesh point
int stepX = (int)offsetX;
float fractionalX = offsetX - (float)stepX;
// physicsScene.DetailLog("{0},BSTerrainMesh.ConvertHeightMapToMesh2,xx={1},yy={2},offX={3},stepX={4},fractX={5},offY={6},stepY={7},fractY={8}",
// BSScene.DetailLogZero, xx, yy, offsetX, stepX, fractionalX, offsetY, stepY, fractionalY);
// get the four corners of the heightmap square the mesh point is in
float heightUL = hmap.GetHeight(stepX , stepY );
float heightUR = hmap.GetHeight(stepX + 1, stepY );
float heightLL = hmap.GetHeight(stepX , stepY + 1);
float heightLR = hmap.GetHeight(stepX + 1, stepY + 1);
// bilinear interplolation
float height = heightUL * (1 - fractionalX) * (1 - fractionalY)
+ heightUR * fractionalX * (1 - fractionalY)
+ heightLL * (1 - fractionalX) * fractionalY
+ heightLR * fractionalX * fractionalY;
// physicsScene.DetailLog("{0},BSTerrainMesh.ConvertHeightMapToMesh2,heightUL={1},heightUR={2},heightLL={3},heightLR={4},heightMap={5}",
// BSScene.DetailLogZero, heightUL, heightUR, heightLL, heightLR, height);
minHeight = Math.Min(minHeight, height);
vertices[verticesCount + 0] = (float)xx * meshXStep + extentBase.X;
vertices[verticesCount + 1] = (float)yy * meshYStep + extentBase.Y;
vertices[verticesCount + 2] = height + extentBase.Z;
verticesCount += 3;
}
}
// The number of vertices generated
verticesCount /= 3;
// Loop through all the heightmap squares and create indices for the two triangles for that square
for (int yy = 0; yy < meshY; yy++)
{
for (int xx = 0; xx < meshX; xx++)
{
int offset = yy * (meshX + 1) + xx;
// Each vertices is presumed to be the upper left corner of a box of two triangles
indices[indicesCount + 0] = offset;
indices[indicesCount + 1] = offset + 1;
indices[indicesCount + 2] = offset + meshX + 1; // accounting for the extra column
indices[indicesCount + 3] = offset + 1;
indices[indicesCount + 4] = offset + meshX + 2;
indices[indicesCount + 5] = offset + meshX + 1;
indicesCount += 6;
}
}
ret = true;
}
catch (Exception e)
{
if (physicsScene != null)
physicsScene.Logger.ErrorFormat("{0} Failed conversion of heightmap to mesh. For={1}/{2}, e={3}",
LogHeader, physicsScene.RegionName, extentBase, e);
}
indicesCountO = indicesCount;
indicesO = indices;
verticesCountO = verticesCount;
verticesO = vertices;
return ret;
}
// Convert the passed heightmap to mesh information suitable for CreateMeshShape2().
// Version that handles magnification.
// Return 'true' if successfully created.
public static bool ConvertHeightmapToMesh2(BSScene physicsScene,
float[] heightMap, int sizeX, int sizeY, // parameters of incoming heightmap
int magnification, // number of vertices per heighmap step
Vector3 extent, // dimensions of the output mesh
Vector3 extentBase, // base to be added to all vertices
out int indicesCountO, out int[] indicesO,
out int verticesCountO, out float[] verticesO)
{
bool ret = false;
int indicesCount = 0;
int verticesCount = 0;
int[] indices = new int[0];
float[] vertices = new float[0];
HeightMapGetter hmap = new HeightMapGetter(heightMap, sizeX, sizeY);
// The vertices dimension of the output mesh
int meshX = sizeX * magnification;
int meshY = sizeY * magnification;
// The output size of one mesh step
float meshXStep = extent.X / meshX;
float meshYStep = extent.Y / meshY;
// Create an array of vertices that is meshX+1 by meshY+1 (note the loop
// from zero to <= meshX). The triangle indices are then generated as two triangles
// per heightmap point. There are meshX by meshY of these squares. The extra row and
// column of vertices are used to complete the triangles of the last row and column
// of the heightmap.
try
{
// Vertices for the output heightmap plus one on the side and bottom to complete triangles
int totalVertices = (meshX + 1) * (meshY + 1);
vertices = new float[totalVertices * 3];
int totalIndices = meshX * meshY * 6;
indices = new int[totalIndices];
if (physicsScene != null)
{
physicsScene.DetailLog(
"{0},BSTerrainMesh.ConvertHeightMapToMesh2,inSize={1},outSize={2},totVert={3},totInd={4},extentBase={5}",
BSScene.DetailLogZero, new Vector2(sizeX, sizeY), new Vector2(meshX, meshY),
totalVertices, totalIndices, extentBase);
}
float minHeight = float.MaxValue;
// Note that sizeX+1 vertices are created since there is land between this and the next region.
// Loop through the output vertices and compute the mediun height in between the input vertices
for (int yy = 0; yy <= meshY; yy++)
{
for (int xx = 0; xx <= meshX; xx++) // Hint: the "<=" means we go around sizeX + 1 times
{
float offsetY = (float)yy * (float)sizeY / (float)meshY;
// The Y that is closest to the mesh point
int stepY = (int)offsetY;
float fractionalY = offsetY - (float)stepY;
float offsetX = (float)xx * (float)sizeX / (float)meshX;
// The X that is closest to the mesh point
int stepX = (int)offsetX;
float fractionalX = offsetX - (float)stepX;
// physicsScene.DetailLog("{0},BSTerrainMesh.ConvertHeightMapToMesh2,xx={1},yy={2},offX={3},stepX={4},fractX={5},offY={6},stepY={7},fractY={8}",
// BSScene.DetailLogZero, xx, yy, offsetX, stepX, fractionalX, offsetY, stepY, fractionalY);
// get the four corners of the heightmap square the mesh point is in
float heightUL = hmap.GetHeight(stepX, stepY);
float heightUR = hmap.GetHeight(stepX + 1, stepY);
float heightLL = hmap.GetHeight(stepX, stepY + 1);
float heightLR = hmap.GetHeight(stepX + 1, stepY + 1);
// bilinear interplolation
float height = heightUL * (1 - fractionalX) * (1 - fractionalY)
+ heightUR * fractionalX * (1 - fractionalY)
+ heightLL * (1 - fractionalX) * fractionalY
+ heightLR * fractionalX * fractionalY;
// physicsScene.DetailLog("{0},BSTerrainMesh.ConvertHeightMapToMesh2,heightUL={1},heightUR={2},heightLL={3},heightLR={4},heightMap={5}",
// BSScene.DetailLogZero, heightUL, heightUR, heightLL, heightLR, height);
minHeight = Math.Min(minHeight, height);
vertices[verticesCount + 0] = (float)xx * meshXStep + extentBase.X;
vertices[verticesCount + 1] = (float)yy * meshYStep + extentBase.Y;
vertices[verticesCount + 2] = height + extentBase.Z;
verticesCount += 3;
}
}
// The number of vertices generated
verticesCount /= 3;
// Loop through all the heightmap squares and create indices for the two triangles for that square
for (int yy = 0; yy < meshY; yy++)
{
for (int xx = 0; xx < meshX; xx++)
{
int offset = yy * (meshX + 1) + xx;
// Each vertices is presumed to be the upper left corner of a box of two triangles
indices[indicesCount + 0] = offset;
indices[indicesCount + 1] = offset + 1;
indices[indicesCount + 2] = offset + meshX + 1; // accounting for the extra column
indices[indicesCount + 3] = offset + 1;
indices[indicesCount + 4] = offset + meshX + 2;
indices[indicesCount + 5] = offset + meshX + 1;
indicesCount += 6;
}
}
ret = true;
}
catch (Exception e)
{
if (physicsScene != null)
{
physicsScene.Logger.ErrorFormat("{0} Failed conversion of heightmap to mesh. For={1}/{2}, e={3}",
LogHeader, physicsScene.RegionName, extentBase, e);
}
}
indicesCountO = indicesCount;
indicesO = indices;
verticesCountO = verticesCount;
verticesO = vertices;
return(ret);
}
