static VoxelData Read(BinaryReader reader)
{
var magic = reader.ReadUInt32();
var version = reader.ReadInt32();
if (magic != VOX_)
{
return(null);
}
var voxelData = null as VoxelData;
var colors = null as Color[];
while (reader.PeekChar() != -1)
{
var chunkId = reader.ReadUInt32();
var chunkSize = reader.ReadInt32();
var childChunks = reader.ReadInt32();
switch (chunkId)
{
case SIZE:
var sx = reader.ReadInt32();
var sy = reader.ReadInt32();
var sz = reader.ReadInt32();
reader.ReadBytes(chunkSize - sizeof(int) * 3);
voxelData = new VoxelData(new XYZ(sx, sy, sz), new Color[256]);
break;
case XYZI:
var n = reader.ReadInt32();
for (var i = 0; i < n; ++i)
{
var x = reader.ReadByte();
var y = reader.ReadByte();
var z = reader.ReadByte();
var c = reader.ReadByte();
voxelData[new XYZ(x, y, z)] = new Voxel()
{
Index = c
};
}
break;
case RGBA:
colors = new Color[256];
// last color is not used, so we only need to read 255 colors
for (var i = 1; i < 256; ++i)
{
byte r = reader.ReadByte();
byte g = reader.ReadByte();
byte b = reader.ReadByte();
byte a = reader.ReadByte();
voxelData.Colors[i] = new Color(r, g, b, a);
}
// NOTICE : skip the last reserved color
reader.ReadUInt32();
break;
default:
reader.ReadBytes(chunkSize);
break;
}
}
if (voxelData != null && colors == null)
{
for (var i = 0; i < DefaultColors.Length; ++i)
{
voxelData.Colors[i] = new Color(DefaultColors[i]);
}
}
return(voxelData);
}
void RenderQuad(VoxelData voxelData, XYZ p, Color color, float lightLevel, XYZ faceUp)
{
// Only render quad if face it isn't hidden by voxel above it
if (voxelData[p + faceUp].Index == 0)
{
// Calculate adjacent voxels
var adjacent = new XYZ[] { XYZ.Zero, XYZ.Zero, XYZ.Zero, XYZ.Zero };
if (faceUp == -XYZ.OneX)
{
adjacent = new[] { XYZ.OneY, XYZ.OneZ, -XYZ.OneY, -XYZ.OneZ };
}
if (faceUp == -XYZ.OneY)
{
adjacent = new[] { XYZ.OneZ, XYZ.OneX, -XYZ.OneZ, -XYZ.OneX };
}
if (faceUp == -XYZ.OneZ)
{
adjacent = new[] { XYZ.OneX, XYZ.OneY, -XYZ.OneX, -XYZ.OneY };
}
if (faceUp == XYZ.OneX)
{
adjacent = new[] { XYZ.OneZ, XYZ.OneY, -XYZ.OneZ, -XYZ.OneY };
}
if (faceUp == XYZ.OneY)
{
adjacent = new[] { XYZ.OneX, XYZ.OneZ, -XYZ.OneX, -XYZ.OneZ };
}
if (faceUp == XYZ.OneZ)
{
adjacent = new[] { XYZ.OneY, XYZ.OneX, -XYZ.OneY, -XYZ.OneX };
}
// Calculate ambient occlusion vertex colors
var a00 = AmbientOcclusion.CalculateAO(voxelData, p, adjacent[0], adjacent[1], faceUp);
var a01 = AmbientOcclusion.CalculateAO(voxelData, p, adjacent[1], adjacent[2], faceUp);
var a11 = AmbientOcclusion.CalculateAO(voxelData, p, adjacent[2], adjacent[3], faceUp);
var a10 = AmbientOcclusion.CalculateAO(voxelData, p, adjacent[3], adjacent[0], faceUp);
// Ignore shadow face there is no occlusion
if (p.Z == -1 && (a00 + a01 + a11 + a10) == 12)
{
return;
}
// Store vertex colors
colors.AddRange(new[] { color *lightLevel, color *lightLevel, color *lightLevel, color *lightLevel });
// Calculate occlusion values
occlusion.Add(AmbientOcclusion.AOToOcclusion(a00));
occlusion.Add(AmbientOcclusion.AOToOcclusion(a01));
occlusion.Add(AmbientOcclusion.AOToOcclusion(a11));
occlusion.Add(AmbientOcclusion.AOToOcclusion(a10));
// Calculate quad vertices based on adjacent voxels
var v0 = p + (adjacent[0] + adjacent[1] + faceUp + XYZ.One) / 2;
var v1 = p + (adjacent[1] + adjacent[2] + faceUp + XYZ.One) / 2;
var v2 = p + (adjacent[2] + adjacent[3] + faceUp + XYZ.One) / 2;
var v3 = p + (adjacent[3] + adjacent[0] + faceUp + XYZ.One) / 2;
var n = vertices.Count;
vertices.AddRange(new[] { v0, v1, v2, v3 });
// Populate Normals
normals.AddRange(new[] { faceUp, faceUp, faceUp, faceUp });
// Add face primitives for MeshType
var i0 = (n + 0);
var i1 = (n + 1);
var i2 = (n + 2);
var i3 = (n + 3);
switch (settings.MeshType)
{
case MeshType.Triangles:
// Change quad -> triangle face orientation based on ambient occlusion
if (a00 + a11 <= a01 + a10)
{
faces.AddRange(new[] { i1, i2, i3, i3, i0, i1 });
}
else
{
faces.AddRange(new[] { i0, i1, i2, i2, i3, i0 });
}
break;
case MeshType.Quads:
faces.AddRange(new [] { i0, i1, i2, i3 });
break;
}
}
}
public static void Write(Stream stream, VoxelData voxelData)
{
Write(new BinaryWriter(stream), voxelData);
}
public MeshBuilder(VoxelData voxelData, MeshSettings settings)
{
this.settings = settings;
CreateMesh(voxelData);
}
