private Vector3 calculateCenterPoint(ObjModel model)
{
OpenGL gl = openGLControl1.OpenGL;
var verticsSortByX = from v in model.Vertics
orderby v.X descending
select v;
var verticsSortByY = from v in model.Vertics
orderby v.Y descending
select v;
var verticsSortByZ = from v in model.Vertics
orderby v.Z descending
select v;
var vertexMaxHeightPoint = verticsSortByZ.ElementAt(0);
var vertexMinHeightPoint = verticsSortByZ.Last();
var vertexMaxRightPoint = verticsSortByX.ElementAt(0);
var vertexMinRightPoint = verticsSortByX.Last();
var vertexMaxFrontPoint = verticsSortByY.ElementAt(0);
var vertexMinFrontPoint = verticsSortByY.Last();
var maxPoint = new Vector3()
{
X = vertexMaxRightPoint.X, Y = vertexMaxFrontPoint.Y, Z = vertexMaxHeightPoint.Z
};
var minPoint = new Vector3()
{
X = vertexMinRightPoint.X, Y = vertexMinFrontPoint.Y, Z = vertexMinHeightPoint.Z
};
return(new Vector3()
{
X = (maxPoint.X + minPoint.X) / 2, Y = (maxPoint.Y + minPoint.Y) / 2, Z = (maxPoint.Z + minPoint.Z) / 2
});
}
private void OpenGLControl1_OpenGLDraw(object sender, RenderEventArgs args)
{
if (Ready)
{
model = new ObjModel(ObjFile);
OpenGL gl = this.openGLControl1.OpenGL;
gl.Clear(OpenGL.GL_COLOR_BUFFER_BIT | OpenGL.GL_DEPTH_BUFFER_BIT);
gl.LoadIdentity();
currentX = Math.Sin(angle) * radius;
currentZ = Math.Cos(angle) * radius;
var centerPoint = calculateCenterPoint(model);
gl.LookAt(
currentX, 0, currentZ,
centerPoint.X, centerPoint.Y, centerPoint.Z,
0, 1, 0);
gl.Rotate(-rotation, 0, 1, 0);
rotation += 3.0f;
for (int i = 0; i < model.Faces.Length; i++)
{
var face = model.Faces[i];
if (face.IsQuad)
{
gl.Begin(OpenGL.GL_QUADS);
{
var v1 = model.Vertics[face.Points[0].VertexIndex - 1];
var vn1 = model.VertexNormals[face.Points[0].NormalIndex - 1];
var vt1 = model.VertexTextures[face.Points[0].TextureIndex - 1];
var v2 = model.Vertics[face.Points[1].VertexIndex - 1];
var vn2 = model.VertexNormals[face.Points[1].NormalIndex - 1];
var vt2 = model.VertexTextures[face.Points[1].TextureIndex - 1];
var v3 = model.Vertics[face.Points[2].VertexIndex - 1];
var vn3 = model.VertexNormals[face.Points[2].NormalIndex - 1];
var vt3 = model.VertexTextures[face.Points[2].TextureIndex - 1];
var v4 = model.Vertics[face.Points[3].VertexIndex - 1];
var vn4 = model.VertexNormals[face.Points[3].NormalIndex - 1];
var vt4 = model.VertexTextures[face.Points[3].TextureIndex - 1];
gl.TexCoord(vt1.X, vt1.Y * -1);
gl.Normal(vn1.X, vn1.Y, vn1.Z);
gl.Vertex(v1.X, v1.Y, v1.Z);
gl.TexCoord(vt2.X, vt2.Y * -1);
gl.Normal(vn2.X, vn2.Y, vn2.Z);
gl.Vertex(v2.X, v2.Y, v2.Z);
gl.TexCoord(vt3.X, vt3.Y * -1);
gl.Normal(vn3.X, vn3.Y, vn3.Z);
gl.Vertex(v3.X, v3.Y, v3.Z);
gl.TexCoord(vt4.X, vt4.Y * -1);
gl.Normal(vn4.X, vn4.Y, vn4.Z);
gl.Vertex(v4.X, v4.Y, v4.Z);
}
gl.End();
}
else
{
gl.Begin(SharpGL.Enumerations.BeginMode.Triangles);
{
var v1 = model.Vertics[face.Points[0].VertexIndex - 1];
var vn1 = model.VertexNormals[face.Points[0].NormalIndex - 1];
var vt1 = model.VertexTextures[face.Points[0].TextureIndex - 1];
var v2 = model.Vertics[face.Points[1].VertexIndex - 1];
var vn2 = model.VertexNormals[face.Points[1].NormalIndex - 1];
var vt2 = model.VertexTextures[face.Points[1].TextureIndex - 1];
var v3 = model.Vertics[face.Points[2].VertexIndex - 1];
var vn3 = model.VertexNormals[face.Points[2].NormalIndex - 1];
var vt3 = model.VertexTextures[face.Points[2].TextureIndex - 1];
gl.TexCoord(vt1.X, vt1.Y * -1);
gl.Normal(vn1.X, vn1.Y, vn1.Z);
gl.Vertex(v1.X, v1.Y, v1.Z);
gl.TexCoord(vt2.X, vt2.Y * -1);
gl.Normal(vn2.X, vn2.Y, vn2.Z);
gl.Vertex(v2.X, v2.Y, v2.Z);
gl.TexCoord(vt3.X, vt3.Y * -1);
gl.Normal(vn3.X, vn3.Y, vn3.Z);
gl.Vertex(v3.X, v3.Y, v3.Z);
}
gl.End();
}
gl.Flush();
}
}
}