private void AddComponentsToMesh(gltf.Mesh targetMesh, ShapeComponentIds osgGeom, int materialIndex)
{
gltf.MeshPrimitive thisPrimitive = new gltf.MeshPrimitive();
Dictionary <string, int> att = new Dictionary <string, int>();
att.Add("NORMAL", osgGeom.NormalsAccessorId);
att.Add("POSITION", osgGeom.VerticesAccessorId);
thisPrimitive.Attributes = att;
thisPrimitive.Indices = osgGeom.IndicesAccessorId;
thisPrimitive.Material = materialIndex;
thisPrimitive.Mode = gltf.MeshPrimitive.ModeEnum.TRIANGLES;
int initSize = targetMesh.Primitives != null
? targetMesh.Primitives.Length
: 0;
if (initSize == 0)
{
targetMesh.Primitives = new gltf.MeshPrimitive[] { thisPrimitive };
}
else
{
var concat = targetMesh.Primitives.ToList();
concat.Add(thisPrimitive);
targetMesh.Primitives = concat.ToArray();
}
}
private static RenderData ProcessPrimitive(ILogger logger, glTFLoader.Schema.MeshPrimitive primitive, Gltf gltf, byte[][] buffers, DisplayStyle displayStyle, Outline outline, Transform transform)
{
if (primitive.Mode != MeshPrimitive.ModeEnum.TRIANGLES)
{
logger.Debug("The selected primitive mode is not supported.");
return(null);
}
var indexAccessor = gltf.Accessors[(int)primitive.Indices];
var positionAccessor = gltf.Accessors[primitive.Attributes["POSITION"]];
var normalAccessor = gltf.Accessors[primitive.Attributes["NORMAL"]];
var hasColor = primitive.Attributes.ContainsKey("COLOR_0");
var indexBufferView = gltf.BufferViews[(int)indexAccessor.BufferView];
var positionBufferView = gltf.BufferViews[(int)positionAccessor.BufferView];
var normalBufferView = gltf.BufferViews[(int)normalAccessor.BufferView];
var indices = new List <int>();
for (var i = indexBufferView.ByteOffset; i < indexBufferView.ByteOffset + indexBufferView.ByteLength; i += indexBufferView.ByteStride ?? sizeof(ushort))
{
var index = BitConverter.ToUInt16(buffers[indexBufferView.Buffer], i);
indices.Add(index);
}
var floatSize = sizeof(float);
var positions = new List <XYZ>();
for (var i = positionBufferView.ByteOffset; i < positionBufferView.ByteOffset + positionBufferView.ByteLength; i += positionBufferView.ByteStride ?? (floatSize * 3))
{
// Read x, y, z values
var x = BitConverter.ToSingle(buffers[positionBufferView.Buffer], i);
var y = BitConverter.ToSingle(buffers[positionBufferView.Buffer], i + floatSize);
var z = BitConverter.ToSingle(buffers[positionBufferView.Buffer], i + floatSize * 2);
var pt = new XYZ(Elements.Units.MetersToFeet(x), Elements.Units.MetersToFeet(y), Elements.Units.MetersToFeet(z));
if (transform != null)
{
pt = transform.OfPoint(pt);
}
outline.AddPoint(pt);
positions.Add(pt);
}
var normals = new List <XYZ>();
for (var i = normalBufferView.ByteOffset; i < normalBufferView.ByteOffset + normalBufferView.ByteLength; i += normalBufferView.ByteStride ?? (floatSize * 3))
{
// Read x, y, z values
var x = BitConverter.ToSingle(buffers[normalBufferView.Buffer], i);
var y = BitConverter.ToSingle(buffers[normalBufferView.Buffer], i + floatSize);
var z = BitConverter.ToSingle(buffers[normalBufferView.Buffer], i + floatSize * 2);
var n = new XYZ(x, y, z);
if (transform != null)
{
n = transform.OfVector(n);
}
normals.Add(n);
}
var colors = new List <ColorWithTransparency>();
if (hasColor)
{
var colorAccessor = gltf.Accessors[primitive.Attributes["COLOR_0"]];
var colorBufferView = gltf.BufferViews[(int)colorAccessor.BufferView];
for (var i = colorBufferView.ByteOffset; i < colorBufferView.ByteOffset + colorBufferView.ByteLength; i += colorBufferView.ByteStride ?? (floatSize * 3))
{
// Read x, y, z values
var r = BitConverter.ToSingle(buffers[colorBufferView.Buffer], i);
var g = BitConverter.ToSingle(buffers[colorBufferView.Buffer], i + floatSize);
var b = BitConverter.ToSingle(buffers[colorBufferView.Buffer], i + floatSize * 2);
colors.Add(displayStyle == DisplayStyle.HLR ? new ColorWithTransparency(255, 255, 255, 0) : new ColorWithTransparency((uint)(r * 255), (uint)(g * 255), (uint)(b * 255), 0));
}
}
// The number of vertices will be the same as the length of the indices
// because we'll duplicate vertices at every position.
var numVertices = indices.Count;
var pType = PrimitiveType.TriangleList;
var numPrimitives = indices.Count / 3;
var numIndices = GetPrimitiveSize(pType) * numPrimitives;
VertexFormatBits vertexFormatBits;
switch (displayStyle)
{
case DisplayStyle.HLR:
case DisplayStyle.FlatColors:
vertexFormatBits = VertexFormatBits.PositionColored;
break;
default:
vertexFormatBits = VertexFormatBits.PositionNormalColored;
break;
}
var vertexFormat = new VertexFormat(vertexFormatBits);
var vBuffer = new VertexBuffer(GetVertexSize(vertexFormatBits) * numVertices);
var iBuffer = new IndexBuffer(numIndices);
vBuffer.Map(GetVertexSize(vertexFormatBits) * numVertices);
iBuffer.Map(numIndices);
var verticesFlat = new List <VertexPositionColored>();
var vertices = new List <VertexPositionNormalColored>();
var triangles = new List <IndexTriangle>();
ColorWithTransparency color = null;
if (displayStyle == DisplayStyle.HLR)
{
color = new ColorWithTransparency(255, 255, 255, 0);
}
else if (primitive.Material != null)
{
var material = gltf.Materials[(int)primitive.Material];
var r = (uint)(material.PbrMetallicRoughness.BaseColorFactor[0] * 255);
var g = (uint)(material.PbrMetallicRoughness.BaseColorFactor[1] * 255);
var b = (uint)(material.PbrMetallicRoughness.BaseColorFactor[2] * 255);
var a = (uint)(material.PbrMetallicRoughness.BaseColorFactor[3] * 255);
color = new ColorWithTransparency(r, g, b, a);
}
for (var i = 0; i < indices.Count; i += 3)
{
var ia = indices[i];
var ib = indices[i + 1];
var ic = indices[i + 2];
var a = positions[ia];
var b = positions[ib];
var c = positions[ic];
var na = normals[ia];
var nb = normals[ib];
var nc = normals[ic];
switch (vertexFormatBits)
{
case VertexFormatBits.PositionColored:
if (hasColor)
{
color = colors[ia];
}
verticesFlat.Add(new VertexPositionColored(a, hasColor ? colors[ia] : color));
verticesFlat.Add(new VertexPositionColored(b, hasColor ? colors[ib] : color));
verticesFlat.Add(new VertexPositionColored(c, hasColor ? colors[ic] : color));
break;
default:
if (hasColor)
{
color = colors[ia];
}
vertices.Add(new VertexPositionNormalColored(a, na, hasColor ? colors[ia] : color));
vertices.Add(new VertexPositionNormalColored(b, nb, hasColor ? colors[ib] : color));
vertices.Add(new VertexPositionNormalColored(c, nc, hasColor ? colors[ic] : color));
break;
}
triangles.Add(new IndexTriangle(i, i + 1, i + 2));
}
switch (displayStyle)
{
case DisplayStyle.HLR:
case DisplayStyle.FlatColors:
var pc = vBuffer.GetVertexStreamPositionColored();
pc.AddVertices(verticesFlat);
break;
default:
var pnc = vBuffer.GetVertexStreamPositionNormalColored();
pnc.AddVertices(vertices);
break;
}
var iPos = iBuffer.GetIndexStreamTriangle();
iPos.AddTriangles(triangles);
vBuffer.Unmap();
iBuffer.Unmap();
var effect = new EffectInstance(vertexFormatBits);
var renderData = new RenderData()
{
VertexBuffer = vBuffer,
VertexCount = numVertices,
IndexBuffer = iBuffer,
IndexCount = numIndices,
VertexFormat = vertexFormat,
Effect = effect,
PrimitiveType = pType,
PrimitiveCount = numPrimitives
};
if (displayStyle != DisplayStyle.Wireframe && numPrimitives > 0)
{
DrawContext.FlushBuffer(vBuffer, numVertices, iBuffer, numIndices, vertexFormat, effect, pType, 0, numPrimitives);
}
return(renderData);
}