public static ObjData LoadFromFile(string filePath)
{
using (var streamReader = new StreamReader(filePath))
{
var obj = new ObjData();
string line = null;
while ((line = streamReader.ReadLine()) != null)
{
if (String.IsNullOrWhiteSpace(line))
{
continue;
}
if (line[0] == '#')
{
continue;
}
var tokens = line.Split(' ');
switch (tokens[0])
{
case "v":
{
double x = Double.Parse(tokens[1], CultureInfo.InvariantCulture);
double y = Double.Parse(tokens[2], CultureInfo.InvariantCulture);
double z = Double.Parse(tokens[3], CultureInfo.InvariantCulture);
obj.Vertices.Add(VectorHelpers.Create(x, y, z));
break;
}
case "vt":
{
double u = Double.Parse(tokens[1], CultureInfo.InvariantCulture);
double v = Double.Parse(tokens[2], CultureInfo.InvariantCulture);
obj.TexCoords.Add(VectorHelpers.Create(u, v));
break;
}
case "vn":
{
double x = Double.Parse(tokens[1], CultureInfo.InvariantCulture);
double y = Double.Parse(tokens[2], CultureInfo.InvariantCulture);
double z = Double.Parse(tokens[3], CultureInfo.InvariantCulture);
obj.Normals.Add(VectorHelpers.Create(x, y, z));
break;
}
case "f":
{
var triangle = new IndexedTriangle();
for (int i = 0; i < 3; ++i)
{
var vertexTokens = tokens[i + 1].Split('/');
triangle.Vertices[i] = Int32.Parse(vertexTokens[0]) - 1;
triangle.TexCoords[i] = Int32.Parse(vertexTokens[1]) - 1;
triangle.Normals[i] = Int32.Parse(vertexTokens[2]) - 1;
}
obj.Triangles.Add(triangle);
break;
}
}
}
return(obj);
}
}
public void RenderObjMesh(ObjData meshToRender, Matrix <double> transformation, Matrix <double> normalTransformation)
{
if (Material == null)
{
Material = new Material();
}
if (TexturingEnabled)
{
if (Material.DiffuseTexture != null)
{
Material.DiffuseTexture.Lock();
}
}
var hw = _renderWindow.Framebuffer.PixelWidth * 0.5;
var hh = _renderWindow.Framebuffer.PixelHeight * 0.5;
foreach (var triangle in meshToRender.Triangles)
{
var tri = new PreparedTriangle();
for (int i = 0; i < 3; ++i)
{
Vector <double> modelSpacePosition = meshToRender.Vertices[triangle.Vertices[i]];
Vector <double> modelSpaceNormal = meshToRender.Normals[triangle.Normals[i]];
Vector <double> screenSpacePosition = (transformation * modelSpacePosition.ExtendVector())
.ToCartesian()
.Add(VectorHelpers.Create(1.0, 1.0, 0.0))
.PointwiseMultiply(VectorHelpers.Create(hw, hh, 1.0));
Vector <double> worldSpacePosition = (normalTransformation * modelSpacePosition.ExtendVector())
.ToCartesian();
Vector <double> worldSpaceNormal = (normalTransformation * modelSpaceNormal.ExtendVector(0.0))
.DiscardLastCoordinate().Normalize(2);
// Vertex shader
tri.Vertices[i].SetCoordinates(screenSpacePosition);
tri.Vertices[i].SetTextureCoordinates(meshToRender.TexCoords[triangle.TexCoords[i]]);
var vR = 0;
var vG = 0;
var vB = 0;
if (AmbientLightingEnabled)
{
vR += Material.AmbientColor.R;
vG += Material.AmbientColor.G;
vB += Material.AmbientColor.B;
}
if (DiffuseLightingEnabled || SpecularLightingEnabled)
{
foreach (var light in Lights)
{
var lightDirection = (light.Position - worldSpacePosition).Normalize(2);
if (DiffuseLightingEnabled)
{
var diffuseLightFactor = Math.Max(lightDirection.DotProduct(worldSpaceNormal), 0);
var fullSaturationDiffuseColor = MultiplyColors(light.Color, Material.DiffuseColor);
vR += (byte)(fullSaturationDiffuseColor.R * diffuseLightFactor);
vG += (byte)(fullSaturationDiffuseColor.G * diffuseLightFactor);
vB += (byte)(fullSaturationDiffuseColor.B * diffuseLightFactor);
}
if (SpecularLightingEnabled)
{
var eyeDirection = (WorldPositionEye - worldSpacePosition).Normalize(2);
var reflected = (2 * worldSpaceNormal.DotProduct(lightDirection) * worldSpaceNormal - lightDirection).Normalize(2);
var specularLightFactor = Math.Pow(Math.Max(eyeDirection.DotProduct(reflected), 0), Material.ShineFactor);
var fullSaturationSpecularColor = MultiplyColors(light.Color, Material.SpecularColor);
vR += (byte)(fullSaturationSpecularColor.R * specularLightFactor);
vG += (byte)(fullSaturationSpecularColor.G * specularLightFactor);
vB += (byte)(fullSaturationSpecularColor.B * specularLightFactor);
}
}
}
tri.Vertices[i].VertexColor = Color.FromRgb(
(byte)Math.Min(vR, 255),
(byte)Math.Min(vG, 255),
(byte)Math.Min(vB, 255));
// End of vertex shader
}
DrawScreenSpaceTriangleInterpolated(tri);
}
if (TexturingEnabled && Material.DiffuseTexture != null)
{
Material.DiffuseTexture.Unlock();
}
}