public static GeometryData CreateXYPlane(float[] bindShapeMatrix = null)
{
float[] vertices = new float[] {
-1, -1, 0, // bottom left corner
-1, 1, 0, // top left corner
1, 1, 0, // top right corner
1, -1, 0
};
int[] indices = new int[] {
0, 1, 2, // first triangle (bottom left - top left - top right)
0, 2, 3 // second triangle (bottom left - top right - bottom right)
};
float[] normals = new float[] {
0, 0, 1
};
int[] normalIndices = new int[] {
0, 0, 0, // first triangle (bottom left - top left - top right)
0, 0, 0 // second triangle (bottom left - top right - bottom right)
};
float[] uv = new float[]
{
1, 1,
1, 0,
0, 0,
0, 1
};
int[] uvIndices = new int[] {
0, 1, 2, // first triangle (bottom left - top left - top right)
0, 2, 3 // second triangle (bottom left - top right - bottom right)
};
var data = new PositionNormalUV0Vertex[indices.Length];
var meshIndices = new int[indices.Length];
for (var i = 0; i < indices.Length; i++)
{
var vertex = (bindShapeMatrix != null) ?
new float[] {
vertices[indices[i] * 3],
vertices[indices[i] * 3 + 1],
vertices[indices[i] * 3 + 2]
}.VectorTransform(bindShapeMatrix)
: new float[] {
vertices[indices[i] * 3],
vertices[indices[i] * 3 + 1],
vertices[indices[i] * 3 + 2]
};
data[i].PosX = vertex[0];
data[i].PosY = vertex[1];
data[i].PosZ = vertex[2];
data[i].NormalX = normals[normalIndices[i] * 3];
data[i].NormalY = normals[normalIndices[i] * 3 + 1];
data[i].NormalZ = normals[normalIndices[i] * 3 + 2];
data[i].UvX = uv[uvIndices[i] * 2];
data[i].UvY = uv[uvIndices[i] * 2 + 1];
meshIndices[i] = i;
}
var result = new GeometryData()
{
VertexCount = data.Length,
Indices = meshIndices
};
using (var stream = new System.IO.MemoryStream())
using (var writer = new System.IO.BinaryWriter(stream))
{
for (int i = 0; i < data.Length; i++)
{
writer.Write(data[i].PosX);
writer.Write(data[i].PosY);
writer.Write(data[i].PosZ);
writer.Write(data[i].NormalX);
writer.Write(data[i].NormalY);
writer.Write(data[i].NormalZ);
writer.Write(data[i].UvX);
writer.Write(data[i].UvY);
}
result.Data = stream.ToArray();
}
// add vertex attribs
result.Attribs = new VertexAttrib[]
{
new VertexAttrib()
{
Size = 3,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 0
},
new VertexAttrib()
{
Size = 3,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 3 * sizeof(float)
},
new VertexAttrib()
{
Size = 2,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 6 * sizeof(float)
}
};
return(result);
}
public static GeometryData FromCollada(float[] vertices, int[] indices, int indicesPerFace, float[] normals, int[] normalIndices, float[] uv, int[] uvIndices, float[] bindShapeMatrix = null)
{
var data = new PositionNormalUV0Vertex[indices.Length];
var meshIndices = new int[indices.Length];
for (var i = 0; i < indices.Length; i++)
{
var vertex = (bindShapeMatrix != null) ?
new float[] {
vertices[indices[i] * 3],
vertices[indices[i] * 3 + 1],
vertices[indices[i] * 3 + 2]
}.VectorTransform(bindShapeMatrix)
: new float[] {
vertices[indices[i] * 3],
vertices[indices[i] * 3 + 1],
vertices[indices[i] * 3 + 2]
};
data[i].PosX = vertex[0];
data[i].PosY = vertex[1];
data[i].PosZ = vertex[2];
data[i].NormalX = normals[normalIndices[i] * 3];
data[i].NormalY = normals[normalIndices[i] * 3 + 1];
data[i].NormalZ = normals[normalIndices[i] * 3 + 2];
data[i].UvX = uv[uvIndices[i] * 2];
data[i].UvY = 1f - uv[uvIndices[i] * 2 + 1];
meshIndices[i] = i;
}
// check if we need to triangulate the mesh
if (indicesPerFace == 4)
{
meshIndices = QuadIndicesToTriangles(meshIndices);
}
var result = new GeometryData()
{
VertexCount = data.Length,
Indices = meshIndices
};
using (var stream = new System.IO.MemoryStream())
using (var writer = new System.IO.BinaryWriter(stream))
{
for (int i = 0; i < data.Length; i++)
{
writer.Write(data[i].PosX);
writer.Write(data[i].PosY);
writer.Write(data[i].PosZ);
writer.Write(data[i].NormalX);
writer.Write(data[i].NormalY);
writer.Write(data[i].NormalZ);
writer.Write(data[i].UvX);
writer.Write(data[i].UvY);
}
result.Data = stream.ToArray();
}
// add vertex attribs
result.Attribs = new VertexAttrib[]
{
new VertexAttrib()
{
Size = 3,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 0
},
new VertexAttrib()
{
Size = 3,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 3 * sizeof(float)
},
new VertexAttrib()
{
Size = 2,
Type = (int)OpenTK.Graphics.OpenGL4.VertexAttribPointerType.Float,
Stride = 8 * sizeof(float),
Offset = 6 * sizeof(float)
}
};
return(result);
}
