public MyIsoMesh Precalc(IMyStorage storage, int lod, Vector3I voxelStart, Vector3I voxelEnd, bool generateMaterials, bool useAmbient, bool doNotCheck)
{
m_resultVerticesCounter = 0;
m_resultTrianglesCounter = 0;
m_edgeVertexCalcCounter++;
m_temporaryVoxelsCounter++;
CalcPolygCubeSize(lod, storage.Size);
m_voxelStart = voxelStart;
//voxelStart = voxelStart;
//voxelEnd = voxelEnd;
var ssize = storage.Size;
m_cache.Resize(voxelStart, voxelEnd);
// Load content first, check it if it contains isosurface, early exit if it doesn't.
storage.ReadRange(m_cache, MyStorageDataTypeFlags.Content, lod, ref voxelStart, ref voxelEnd);
if (!m_cache.ContainsIsoSurface())
{
return(null);
}
storage.ReadRange(m_cache, MyStorageDataTypeFlags.Material, lod, ref voxelStart, ref voxelEnd);
ProfilerShort.Begin("Marching cubes");
{
// Size of voxel or cell (in meters) and size of voxel map / voxel cells
ComputeSizeAndOrigin(lod, storage.Size);
var start = Vector3I.Zero;
var end = voxelEnd - voxelStart - 3;
Vector3I coord0 = start;
for (var it = new Vector3I.RangeIterator(ref start, ref end); it.IsValid(); it.GetNext(out coord0))
{
int cubeIndex = 0;
if (m_cache.Content(coord0.X + 0, coord0.Y + 0, coord0.Z + 0) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 1;
}
if (m_cache.Content(coord0.X + 1, coord0.Y + 0, coord0.Z + 0) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 2;
}
if (m_cache.Content(coord0.X + 1, coord0.Y + 0, coord0.Z + 1) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 4;
}
if (m_cache.Content(coord0.X + 0, coord0.Y + 0, coord0.Z + 1) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 8;
}
if (m_cache.Content(coord0.X + 0, coord0.Y + 1, coord0.Z + 0) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 16;
}
if (m_cache.Content(coord0.X + 1, coord0.Y + 1, coord0.Z + 0) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 32;
}
if (m_cache.Content(coord0.X + 1, coord0.Y + 1, coord0.Z + 1) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 64;
}
if (m_cache.Content(coord0.X + 0, coord0.Y + 1, coord0.Z + 1) < MyVoxelConstants.VOXEL_ISO_LEVEL)
{
cubeIndex |= 128;
}
// Cube is entirely in/out of the surface
if (MyMarchingCubesConstants.EdgeTable[cubeIndex] == 0)
{
continue;
}
// We can get this voxel content right from cache (not using GetVoxelContent method), because after CopyVoxelContents these array must be filled. But only content, not material, normal, etc.
Vector3I tempVoxelCoord0 = ComputeTemporaryVoxelData(m_cache, ref coord0, cubeIndex, lod);
// Create the triangles
CreateTriangles(ref coord0, cubeIndex, ref tempVoxelCoord0);
}
}
ProfilerShort.End();
double numCellsHalf = 0.5f * (m_cache.Size3D.X);
var voxelSize = MyVoxelConstants.VOXEL_SIZE_IN_METRES * (1 << lod);
var vertexCellOffset = voxelStart - AffectedRangeOffset;
IMyIsoMesherOutputBuffer isomesh = new MyIsoMesh();
for (int i = 0; i < m_resultVerticesCounter; i++)
{
var pos = (m_resultVertices[i].Position - (Vector3)storage.Size / 2) / storage.Size;
m_resultVertices[i].Position = pos;
m_resultVertices[i].PositionMorph = pos;
m_resultVertices[i].NormalMorph = m_resultVertices[i].Normal;
m_resultVertices[i].MaterialMorph = m_resultVertices[i].Material;
m_resultVertices[i].AmbientMorph = m_resultVertices[i].Ambient;
}
for (int i = 0; i < m_resultVerticesCounter; i++)
{
isomesh.WriteVertex(ref m_resultVertices[i].Cell, ref m_resultVertices[i].Position, ref m_resultVertices[i].Normal, (byte)m_resultVertices[i].Material, m_resultVertices[i].Ambient);
}
for (int i = 0; i < m_resultTrianglesCounter; i++)
{
isomesh.WriteTriangle(m_resultTriangles[i].VertexIndex0, m_resultTriangles[i].VertexIndex1, m_resultTriangles[i].VertexIndex2);
}
var mIsoMesh = (MyIsoMesh)isomesh;
mIsoMesh.PositionOffset = storage.Size / 2;
mIsoMesh.PositionScale = storage.Size;
mIsoMesh.CellStart = voxelStart;
mIsoMesh.CellEnd = voxelEnd;
var vertexCells = mIsoMesh.Cells.GetInternalArray();
for (int i = 0; i < mIsoMesh.VerticesCount; i++)
{
vertexCells[i] += vertexCellOffset;
}
return((MyIsoMesh)isomesh);
}
public MyIsoMesh Precalc(IMyStorage storage, int lod, Vector3I voxelStart, Vector3I voxelEnd, bool generateMaterials, bool useAmbient, bool doNotCheck = false)
{
// change range so normal can be computed at edges (expand by 1 in all directions)
voxelStart -= 1;
voxelEnd += 1;
if (storage == null)
{
return(null);
}
using (storage.Pin())
{
if (storage.Closed)
{
return(null);
}
MyVoxelRequestFlags request = MyVoxelRequestFlags.ContentChecked; // | (doNotCheck ? MyVoxelRequestFlags.DoNotCheck : 0);
//if (lod == 0 && generateMaterials) request |= MyVoxelRequestFlags.AdviseCache;
bool readAmbient = false;
if (generateMaterials && storage.DataProvider != null && storage.DataProvider.ProvidesAmbient)
{
readAmbient = true;
}
m_cache.Resize(voxelStart, voxelEnd);
if (readAmbient)
{
m_cache.StoreOcclusion = true;
}
storage.ReadRange(m_cache, MyStorageDataTypeFlags.Content, lod, ref voxelStart, ref voxelEnd, ref request);
if (request.HasFlag(MyVoxelRequestFlags.EmptyContent) || request.HasFlag(MyVoxelRequestFlags.FullContent) ||
(!request.HasFlag(MyVoxelRequestFlags.ContentChecked) && !m_cache.ContainsIsoSurface()))
{
//if(generateMaterials && lod == 0) Debugger.Break();
//storage.DebugDrawChunk(voxelStart, voxelEnd);
return(null);
}
var center = (storage.Size / 2) * MyVoxelConstants.VOXEL_SIZE_IN_METRES;
var voxelSize = MyVoxelConstants.VOXEL_SIZE_IN_METRES * (1 << lod);
var vertexCellOffset = voxelStart - AffectedRangeOffset;
double numCellsHalf = 0.5 * (m_cache.Size3D.X - 3);
var posOffset = ((Vector3D)vertexCellOffset + numCellsHalf) * (double)voxelSize;
if (generateMaterials)
{
// 255 is the new black
m_cache.ClearMaterials(255);
}
if (readAmbient)
{
m_cache.Clear(MyStorageDataTypeEnum.Occlusion, 0);
}
IsoMesher mesher = new IsoMesher();
ProfilerShort.Begin("Dual Contouring");
unsafe
{
fixed(byte *content = m_cache[MyStorageDataTypeEnum.Content])
fixed(byte *material = m_cache[MyStorageDataTypeEnum.Material])
{
var size3d = m_cache.Size3D;
Debug.Assert(size3d.X == size3d.Y && size3d.Y == size3d.Z);
mesher.Calculate(size3d.X, content, material, m_buffer, useAmbient, posOffset - center);
}
}
ProfilerShort.End();
if (generateMaterials)
{
request = 0;
request |= MyVoxelRequestFlags.SurfaceMaterial;
request |= MyVoxelRequestFlags.ConsiderContent;
var req = readAmbient ? MyStorageDataTypeFlags.Material | MyStorageDataTypeFlags.Occlusion : MyStorageDataTypeFlags.Material;
storage.ReadRange(m_cache, req, lod, ref voxelStart, ref voxelEnd, ref request);
FixCacheMaterial(voxelStart, voxelEnd);
unsafe
{
fixed(byte *content = m_cache[MyStorageDataTypeEnum.Content])
fixed(byte *material = m_cache[MyStorageDataTypeEnum.Material])
{
int materialOverride = request.HasFlag(MyVoxelRequestFlags.OneMaterial) ? m_cache.Material(0) : -1;
var size3d = m_cache.Size3D;
Debug.Assert(size3d.X == size3d.Y && size3d.Y == size3d.Z);
if (readAmbient)
fixed(byte *ambient = m_cache[MyStorageDataTypeEnum.Occlusion])
mesher.CalculateMaterials(size3d.X, content, material, ambient, materialOverride);
else
{
mesher.CalculateMaterials(size3d.X, content, material, null, materialOverride);
}
}
}
}
else
{
m_cache.ClearMaterials(0);
}
mesher.Finish(m_buffer);
if (m_buffer.VerticesCount == 0 || m_buffer.Triangles.Count == 0)
{
return(null);
}
ProfilerShort.Begin("Geometry post-processing");
{
var positions = m_buffer.Positions.GetInternalArray();
var vertexCells = m_buffer.Cells.GetInternalArray();
var materials = m_buffer.Materials.GetInternalArray();
for (int i = 0; i < m_buffer.VerticesCount; i++)
{
Debug.Assert(positions[i].IsInsideInclusive(ref Vector3.MinusOne, ref Vector3.One));
vertexCells[i] += vertexCellOffset;
Debug.Assert(vertexCells[i].IsInsideInclusive(voxelStart + 1, voxelEnd - 1));
Debug.Assert(materials[i] != MyVoxelConstants.NULL_MATERIAL);
}
m_buffer.PositionOffset = posOffset;
m_buffer.PositionScale = new Vector3((float)(numCellsHalf * voxelSize));
m_buffer.CellStart = voxelStart + 1;
m_buffer.CellEnd = voxelEnd - 1;
}
ProfilerShort.End();
// Replace filled mesh with new one.
// This way prevents allocation of meshes which then end up empty.
var buffer = m_buffer;
m_buffer = new MyIsoMesh();
return(buffer);
}
}