103 lines
4.0 KiB
C#
103 lines
4.0 KiB
C#
using System.Collections.Generic;
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using System.IO;
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using System.Numerics;
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using Microsoft.Xna.Framework.Graphics;
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namespace Smuggler
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{
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public static class Importer
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{
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public static Model ImportGLTF(GraphicsDevice graphicsDevice, Stream stream)
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{
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var sharpModel = SharpGLTF.Schema2.ModelRoot.ReadGLB(stream);
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var meshes = new List<Mesh>();
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foreach (var mesh in sharpModel.LogicalMeshes)
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{
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var meshParts = new List<MeshPart>();
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foreach (var primitive in mesh.Primitives)
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{
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var positionAccessor = primitive.GetVertexAccessor("POSITION").AsVector3Array();
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var normalAccessor = primitive.GetVertexAccessor("NORMAL").AsVector3Array();
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var texcoordAccessor = primitive.GetVertexAccessor("TEXCOORD_0").AsVector2Array();
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var indexAccessor = primitive.GetIndexAccessor().AsIndicesArray();
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var positions = new Vector3[positionAccessor.Count];
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var normals = new Vector3[normalAccessor.Count];
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var texcoords = new Vector2[texcoordAccessor.Count];
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var triangles = new List<Triangle>();
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for (int i = 0; i < positions.Length; i++)
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{
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var position = positionAccessor[i];
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positions[i] = new Vector3(-position.X, -position.Z, position.Y);
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}
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for (int i = 0; i < normals.Length; i++)
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{
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var normal = normalAccessor[i];
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normals[i] = -new Vector3(normal.X, normal.Z, normal.Y);
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}
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foreach (var (a, b, c) in primitive.GetTriangleIndices())
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{
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triangles.Add(new Triangle(a, b, c));
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}
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var vertexBuffer = new VertexBuffer(
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graphicsDevice,
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typeof(VertexPositionNormalTexture),
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positions.Length,
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BufferUsage.WriteOnly
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);
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var indexBuffer = new IndexBuffer(
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graphicsDevice,
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IndexElementSize.ThirtyTwoBits,
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indexAccessor.Count,
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BufferUsage.WriteOnly
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);
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var vertices = new VertexPositionNormalTexture[primitive.IndexAccessor.Count];
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var indices = new uint[primitive.IndexAccessor.Count];
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var indexCounter = 0;
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foreach (var index in primitive.GetIndices())
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{
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var position = positions[index];
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var normal = normals[index];
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var texcoord = texcoords[index];
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indices[indexCounter] = index;
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vertices[index] = new VertexPositionNormalTexture(
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new Microsoft.Xna.Framework.Vector3(position.X, position.Y, position.Z),
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new Microsoft.Xna.Framework.Vector3(normal.X, normal.Y, normal.Z),
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new Microsoft.Xna.Framework.Vector2(texcoord.X, texcoord.Y)
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);
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indexCounter++;
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}
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indexBuffer.SetData(indices);
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vertexBuffer.SetData(vertices);
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meshParts.Add(
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new MeshPart(
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vertexBuffer,
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indexBuffer,
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triangles.ToArray(),
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new BasicEffect(graphicsDevice)
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)
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);
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}
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meshes.Add(new Mesh(meshParts.ToArray()));
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}
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return new Model(meshes.ToArray());
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}
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}
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}
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