protected override TerrainMeshData RescaleMeshHeight(TerrainMeshData referenceMeshData)
{
float scale = _metadata.HeightScale / TerrainModelScale;
float radius = _metadata.Radius;
Vector3[] referenceVertices = referenceMeshData.Vertices;
int vertexCount = referenceVertices.Length;
Vector3[] rescaledVertices = new Vector3[vertexCount];
for (int i = 0; i < vertexCount; i++)
{
Vector3 vertex = referenceVertices[i];
// Calculate new distance
float distance = vertex.magnitude;
float newDistance = (distance - radius) * scale + radius;
// Apply new distance
vertex *= newDistance / distance;
// Store vertex in new array.
rescaledVertices[i] = vertex;
}
return(new TerrainMeshData()
{
Vertices = rescaledVertices
// TODO Normals
});
}
// TODO Use a struct or class to pass DEM metadata (ie. scale) to the GenerateMesh methods.
/// <summary>
/// Generates the mesh data and store it in the member variable.
/// </summary>
protected override void Generate()
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
// TODO Add support other image types if necessary.
// Create and execute task to convert first image into an RGBImage object.
// The task can be executed syncronously in the same thread since Generate()
// is called outside of the main thread.
IntensityImage baseImage = new LoadIntensityImageFromFileTask(_demFilePaths[0]).ExecuteInCurrentThread();
Debug.Log($"Took {stopwatch.ElapsedMilliseconds}ms to read DEM image file.");
// If there are more files to process, then load and merge each image.
for (int i = 1; i < _demFilePaths.Length; i++)
{
// Load the additional image.
IntensityImage image = new LoadIntensityImageFromFileTask(_demFilePaths[i]).ExecuteInCurrentThread();
// Merge the images together.
try {
baseImage.Merge(image, -32768);
// NOTE: -32768 happens to be the "blank" value for the global DEM (and probably
// any other files in 16-bit integer). This may not work for files in other formats.
// Update if necessary.
}
catch (Exception e) {
Debug.LogError(e.Message);
continue;
}
}
TerrainMeshData[] meshData = new TerrainMeshData[_metadata.TotalLodLevels];
for (int lodLevel = 0; lodLevel <= _metadata.LodLevels; lodLevel++)
{
int downsample = 1 << (_metadata.BaseDownsample + lodLevel);
meshData[lodLevel] = GenerateForLod(baseImage, downsample);
}
if (_metadata.GenerateAdditionalPhysicsLod)
{
meshData[meshData.Length - 1] = GenerateForLod(baseImage, 1 << _metadata.PhysicsDownsample);
}
_progress = 1.0f;
_meshData = meshData;
}
protected override TerrainMeshData RescaleMeshHeight(TerrainMeshData referenceMeshData)
{
float scale = _metadata.HeightScale / TerrainModelScale;
float radius = _metadata.Radius;
Vector3 min = new Vector3(float.PositiveInfinity, 0, 0);
Vector3[] referenceVertices = referenceMeshData.Vertices;
int vertexCount = referenceVertices.Length;
Vector3[] rescaledVertices = new Vector3[vertexCount];
for (int i = 0; i < vertexCount; i++)
{
// Undo radius offset
Vector3 vertex = referenceVertices[i] + new Vector3(radius, 0, 0);
// Calculate new distance
float distance = vertex.magnitude;
float newDistance = (distance - radius) * scale + radius;
// Apply new distance
vertex *= newDistance / distance;
// Redo radius offset
vertex -= new Vector3(radius, 0, 0);
// Store vertex in new array.
rescaledVertices[i] = vertex;
// Keep track of minimum.
if (vertex.x < min.x)
{
min = vertex;
}
}
Vector3[] referenceExtraVertices = referenceMeshData.ExtraVertices;
int extraVertexCount = referenceExtraVertices.Length;
Vector3[] rescaledExtraVertices = new Vector3[extraVertexCount];
for (int i = 0; i < extraVertexCount; i++)
{
Vector3 vertex;
// Only the first half of the vertex follows the terrain coutours;
// the second half is the flat base.
if (i >= extraVertexCount / 2)
{
vertex = referenceExtraVertices[i];
rescaledExtraVertices[i] = new Vector3(min.x, vertex.y, vertex.z);
continue;
}
// Undo radius offset
vertex = referenceExtraVertices[i] + new Vector3(radius, 0, 0);
// Calculate new distance
float distance = vertex.magnitude;
float newDistance = (distance - radius) * scale + radius;
// Apply new distance
vertex *= newDistance / distance;
// Redo radius offset
vertex -= new Vector3(radius, 0, 0);
// Store vertex in new array.
rescaledExtraVertices[i] = vertex;
}
return(new TerrainMeshData()
{
Vertices = rescaledVertices,
ExtraVertices = rescaledExtraVertices,
MinimumVertex = min
// TODO Normals
});
}
protected override void Generate()
{
float latIncrement = _boundingBox.LatSwing / (LatLongVertCount - 1);
float lonIncrement = _boundingBox.LonSwing / (LatLongVertCount - 1);
Vector3[] verts = new Vector3[LatLongVertCount * LatLongVertCount];
Vector2[] uvs = new Vector2[LatLongVertCount * LatLongVertCount];
Vector3[] edgeVerts = new Vector3[8 * (LatLongVertCount - 1) + 2];
Vector2 latLongOffset = BoundingBoxUtils.MedianLatLon(_boundingBox);
Vector3 min = new Vector3(float.PositiveInfinity, 0, 0);
int yIndex = 0, vertIndex = 0;
for (float vy = _boundingBox.LatStart; yIndex < LatLongVertCount; vy += latIncrement)
{
// Create a new vertex using the latitude angle. The coordinates of this vertex
// will serve as a base for all the other vertices of the same latitude.
Vector3 baseLatVertex = _metadata.Radius * GenerateBaseLatitudeVertex(vy);
int xIndex = 0;
for (float vx = _boundingBox.LonStart; xIndex < LatLongVertCount; vx += lonIncrement)
{
Vector3 vertex = GenerateVertex(baseLatVertex, vx, latLongOffset, _metadata.Radius);
// Keep track of minimum; this will be used later to position the terrain on the table-top.
if (vertex.x < min.x)
{
min = vertex;
}
// Add to edge vertices
if (yIndex == 0)
{
edgeVerts[xIndex] = vertex;
}
else if (xIndex == LatLongVertCount - 1)
{
edgeVerts[LatLongVertCount + yIndex - 1] = vertex;
}
else if (yIndex == LatLongVertCount - 1)
{
edgeVerts[3 * (LatLongVertCount - 1) - xIndex] = vertex;
}
else if (xIndex == 0)
{
edgeVerts[4 * (LatLongVertCount - 1) - yIndex] = vertex;
}
verts[vertIndex] = vertex;
uvs[vertIndex] = GenerateUVCoord(xIndex, yIndex, LatLongVertCount, LatLongVertCount, _uvBounds);
xIndex++;
vertIndex++;
}
yIndex++;
}
// Finish generating the data for the terrain edge.
ProcessEdgeVertices(edgeVerts, min.x);
_progress = 1f;
// Only one LOD is generated.
_meshData = new TerrainMeshData[] {
new TerrainMeshData()
{
Vertices = verts,
TexCoords = uvs,
Triangles = GenerateTriangles(LatLongVertCount, LatLongVertCount),
ExtraVertices = edgeVerts,
ExtraTriangles = GenerateTriangles(edgeVerts.Length / 2, 2, true),
MinimumVertex = min
}
};
}
