public static Onyx3D.Mesh ToOnyx3D(this Assimp.Mesh mesh)
{
Onyx3D.Mesh newMesh = new Onyx3D.Mesh();
newMesh.Indices = mesh.GetIndices();
for (int vi = 0; vi < mesh.VertexCount; ++vi)
{
Vertex newVertex = new Vertex();
newVertex.Position = mesh.Vertices[vi].ToOnyx3D();
if (mesh.HasTextureCoords(0))
{
Assimp.Vector3D texCoord = mesh.TextureCoordinateChannels[0][vi];
newVertex.TexCoord = texCoord.ToOnyx3D().Xy;
}
if (mesh.HasNormals)
{
newVertex.Normal = mesh.Normals[vi].ToOnyx3D().Normalized();
if (mesh.HasTangentBasis)
{
newVertex.Bitangent = mesh.BiTangents[vi].ToOnyx3D().Normalized();
newVertex.Tangent = mesh.Tangents[vi].ToOnyx3D().Normalized();
}
}
newMesh.Vertices.Add(newVertex);
}
newMesh.GenerateVAO();
return(newMesh);
}
public Mesh(Assimp.Mesh mesh)
{
Assign();
bbox = new BoundingBox(Vector3.PositiveInfinity, Vector3.NegativeInfinity);
GL.BindVertexArray(Vao);
GL.EnableVertexAttribArray(0);
GL.EnableVertexAttribArray(1);
int[] indices = mesh.GetIndices();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, Ebo);
GL.BufferData(BufferTarget.ElementArrayBuffer, sizeof(int) * indices.Length, indices, BufferUsageHint.StaticDraw);
iCount = indices.Length;
// positions + normals
float[] vertexData = new float[mesh.VertexCount * 6];
for (int i = 0; i < mesh.VertexCount; ++i)
{
vertexData[i * 6 + 0] = mesh.Vertices[i].X;
vertexData[i * 6 + 1] = mesh.Vertices[i].Y;
vertexData[i * 6 + 2] = mesh.Vertices[i].Z;
bbox.MinPoint.X = Math.Min(bbox.MinPoint.X, mesh.Vertices[i].X);
bbox.MinPoint.Y = Math.Min(bbox.MinPoint.Y, mesh.Vertices[i].Y);
bbox.MinPoint.Z = Math.Min(bbox.MinPoint.Z, mesh.Vertices[i].Z);
bbox.MaxPoint.X = Math.Max(bbox.MaxPoint.X, mesh.Vertices[i].X);
bbox.MaxPoint.Y = Math.Max(bbox.MaxPoint.Y, mesh.Vertices[i].Y);
bbox.MaxPoint.Z = Math.Max(bbox.MaxPoint.Z, mesh.Vertices[i].Z);
try
{
vertexData[i * 6 + 3] = mesh.Normals[i].X;
vertexData[i * 6 + 4] = mesh.Normals[i].Y;
vertexData[i * 6 + 5] = mesh.Normals[i].Z;
}
catch (System.ArgumentOutOfRangeException)
{
System.Console.Error.WriteLine("Failed indexing mesh normals");
throw;
}
}
GL.BindBuffer(BufferTarget.ArrayBuffer, Vbo);
GL.BufferData(BufferTarget.ArrayBuffer, sizeof(float) * vertexData.Length, vertexData, BufferUsageHint.StaticDraw);
GL.VertexAttribPointer(0, 3, VertexAttribPointerType.Float, false, 24, new IntPtr(0));
GL.VertexAttribPointer(1, 3, VertexAttribPointerType.Float, false, 24, new IntPtr(12));
vCount = mesh.VertexCount;
}
public static SceneMesh CreateMesh(Assimp.Mesh resource)
{
var mesh = new SceneMesh();
mesh.MaterialIndex = resource.MaterialIndex;
var vertices = GetVertices(resource, out int stride, out VertexBounds bounds);
mesh.Bounds = new Bounds(bounds.Center, bounds.Extents);
mesh.VertexCount = resource.VertexCount;
mesh.DrawMode = PrimitiveType.Triangles;
GL.BindVertexArray(mesh.VertexArray);
GL.BindBuffer(BufferTarget.ArrayBuffer, mesh.VertexBuffer);
GL.BufferData(BufferTarget.ArrayBuffer,
new IntPtr(vertices.Length * BlittableValueType <float> .Stride),
vertices, BufferUsageHint.StaticDraw);
if (resource.HasFaces)
{
mesh.EnsureElementArray();
GL.BindBuffer(BufferTarget.ElementArrayBuffer, mesh.ElementArray);
if (resource.VertexCount <= short.MaxValue)
{
var indices = resource.GetShortIndices();
mesh.VertexCount = indices.Length;
mesh.ElementArrayType = DrawElementsType.UnsignedShort;
GL.BufferData(BufferTarget.ElementArrayBuffer,
new IntPtr(indices.Length * BlittableValueType <short> .Stride),
indices, BufferUsageHint.StaticDraw);
}
else
{
var indices = resource.GetIndices();
mesh.VertexCount = indices.Length;
mesh.ElementArrayType = DrawElementsType.UnsignedInt;
GL.BufferData(BufferTarget.ElementArrayBuffer,
new IntPtr(indices.Length * BlittableValueType <int> .Stride),
indices, BufferUsageHint.StaticDraw);
}
}
var attrib = 0;
var offset = 0;
if (resource.HasVertices)
{
offset = PushAttribArray(attrib++, ElementSizeVector3D, stride, offset);
}
for (int k = 0; k < resource.TextureCoordinateChannelCount; k++)
{
offset = PushAttribArray(attrib++, resource.UVComponentCount[k], stride, offset);
}
for (int c = 0; c < resource.VertexColorChannelCount; c++)
{
offset = PushAttribArray(attrib++, ElementSizeColor4D, stride, offset);
}
if (resource.HasNormals)
{
PushAttribArray(attrib++, ElementSizeVector3D, stride, offset);
}
GL.BindBuffer(BufferTarget.ElementArrayBuffer, 0);
GL.BindBuffer(BufferTarget.ArrayBuffer, 0);
GL.BindVertexArray(0);
return(mesh);
}
