internal static ThreeMfMesh ParseMesh(XElement element, Dictionary <int, ThreeMfResource> resourceMap)
{
if (element == null)
{
throw new ThreeMfParseException("Missing element <mesh>.");
}
var vertices = new List <ThreeMfVertex>();
foreach (var vertexElement in element.Element(VerticesName).Elements(ThreeMfVertex.VertexName))
{
var vertex = ThreeMfVertex.ParseVertex(vertexElement);
vertices.Add(vertex);
}
var mesh = new ThreeMfMesh();
foreach (var triangleElement in element.Element(TrianglesName).Elements(ThreeMfTriangle.TriangleName))
{
var triangle = ThreeMfTriangle.ParseTriangle(triangleElement, vertices, resourceMap);
mesh.Triangles.Add(triangle);
}
return(mesh);
}
internal static ThreeMfTriangle ParseTriangle(XElement triangleElement, IList <ThreeMfVertex> vertices, Dictionary <int, ThreeMfResource> resourceMap)
{
var v1Index = triangleElement.AttributeIntValueOrThrow(V1AttributeName);
var v2Index = triangleElement.AttributeIntValueOrThrow(V2AttributeName);
var v3Index = triangleElement.AttributeIntValueOrThrow(V3AttributeName);
if (v1Index == v2Index || v1Index == v3Index || v2Index == v3Index)
{
throw new ThreeMfParseException("Triangle must specify distinct indices.");
}
if (v1Index < 0 || v1Index >= vertices.Count ||
v2Index < 0 || v2Index >= vertices.Count ||
v3Index < 0 || v3Index >= vertices.Count)
{
throw new ThreeMfParseException("Triangle vertex index does not exist.");
}
var triangle = new ThreeMfTriangle(vertices[v1Index], vertices[v2Index], vertices[v3Index]);
if (resourceMap.TryGetPropertyResource(triangleElement, PropertyIndexAttributeName, out var propertyResource))
{
triangle.PropertyResource = propertyResource;
triangle.V1PropertyIndex = propertyResource.ParseAndValidateOptionalResourceIndex(triangleElement, V1PropertyAttributeName);
triangle.V2PropertyIndex = propertyResource.ParseAndValidateOptionalResourceIndex(triangleElement, V2PropertyAttributeName);
triangle.V3PropertyIndex = propertyResource.ParseAndValidateOptionalResourceIndex(triangleElement, V3PropertyAttributeName);
}
return(triangle);
}