public MainForm()
{
InitForm();
screen = new Bitmap(Defaults.WIDTH, Defaults.HEIGHT);
renderer = new Renderer(screen, BackgroundColor);
mesh = WaveObjHelper.ReadMeshFromFile(appPath + @"3dModels\bear.obj");
//mesh.RecalculateNormals();
Bitmap texture = Paloma.TargaImage.LoadTargaImage(appPath + @"3dModels\bear.tga");
SceneObject sObject = new SceneObject { mesh = mesh,
material = new Material(texture, RenderType.RegularWithWireframe),
uniformScale = 20f,
rotation = new Float3(40, 150, 0),
localPosition = new Float3(0, -210, 550)
};
renderer.Render(sObject, viewDirection, lightDirection, true);
}
public Bitmap Draw(Mesh mesh, int screenWidth, int screenHeight, params object[] uniforms)
{
float scaleFactor = 300;
Float3x3 S = Float3x3.identity * scaleFactor;
Float3x3 R = Float3x3.getRotationMatrix(0, 0, 0);
for (int i = 0; i < mesh.Vertices.Count; i++)
{
Float3 scaled = mesh.Vertices[i].mul(S);
scaled = scaled.mul(R);
mesh.Vertices[i] = new Float3(scaled.x + WIDTH / 2, scaled.y + HEIGHT / 2, scaled.z);
}
for (int i = 0; i < mesh.Vertices.Count; i++)
{
Float3 v = mesh.Vertices[i];
screen.elDrawPoint(v.x, v.y, color);
}
int c = mesh.Triangles.Count;
for (int i = 0; i < c; i++)
{
Triangle t = mesh.Triangles[i];
Float3 v1 = mesh.Vertices[t[0] - 1];
Float3 v2 = mesh.Vertices[t[1] - 1];
Float3 v3 = mesh.Vertices[t[2] - 1];
screen.elDrawTriangle(v1, v2, v3, getRandomColor());
//screen.elDrawLine(v1.x, v1.y, v2.x, v2.y, color);
//screen.elDrawLine(v2.x, v2.y, v3.x, v3.y, color);
//screen.elDrawLine(v3.x, v3.y, v1.x, v1.y, color);
}
return null;
}
private void RenderWireframe(Mesh mesh, Color color)
{
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Float3 v1 = mesh.Vertices[t[0] - 1].position;
Float3 v2 = mesh.Vertices[t[1] - 1].position;
Float3 v3 = mesh.Vertices[t[2] - 1].position;
bitmap.elDrawLine(v1.xy, v2.xy, color);
bitmap.elDrawLine(v2.xy, v3.xy, color);
bitmap.elDrawLine(v3.xy, v1.xy, color);
}
}
private void RenderRegular(Mesh mesh, Material material, Float3 lightDirection)
{
rasterizer.Rasterize(mesh, material, lightDirection);
// FRAGMENT SHADER
for (int x = 0; x < Defaults.WIDTH; x++)
for (int y = 0; y < Defaults.HEIGHT; y++)
bitmap.elDrawPoint(x, y, zBuffer[x, y].color);
}
private void DrawVertexNormals(Mesh mesh, Color color)
{
for (int i = 0; i < mesh.Vertices.Count; i++)
{
Vertex v = mesh.Vertices[i];
bitmap.elDrawLine(v.position, (v.position + v.normal * 30), color);
}
}
public void Rasterize(Mesh mesh, Material material, Float3 lightDirection)
{
// set interpolated color
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
//v2.normal = v1.normal;
//v3.normal = v1.normal;
int cc1 = (int)(getLamberComponent(v1.normal, lightDirection) * 255);
int cc2 = (int)(getLamberComponent(v2.normal, lightDirection) * 255);
int cc3 = (int)(getLamberComponent(v3.normal, lightDirection) * 255);
v1.color = Color.FromArgb(cc1, cc1, cc1);//.lerpTo(Color.Green, 0.5f);
v2.color = Color.FromArgb(cc2, cc2, cc2);//.lerpTo(Color.Blue, 0.5f);
v3.color = Color.FromArgb(cc3, cc3, cc3);//.lerpTo(Color.Red, 0.5f);
}
for (int i = 0; i < mesh.Triangles.Count; i++)
{
Triangle t = mesh.Triangles[i];
Vertex v1 = mesh.Vertices[t[0] - 1];
Vertex v2 = mesh.Vertices[t[1] - 1];
Vertex v3 = mesh.Vertices[t[2] - 1];
RenderTriangle2(v1, v2, v3, material, lightDirection);
}
}
public static Mesh ReadMeshFromFile(string filePath)
{
Mesh result = new Mesh();
string[] lines = File.ReadAllLines(filePath);
List<Float3> normals = new List<Float3>();
List<Float3> vPositions = new List<Float3>();
List<Float2> uvs = new List<Float2>();
List<WObjTriangle> wTriangles = new List<WObjTriangle>();
for (int i = 0; i < lines.Length; i++)
{
if (lines[i].Length == 0)
continue;
string[] lineParts = ReplaceMultipleSpaces(lines[i]).Split(' ');
// vertex positions
if (lineParts[0] == "v")
{
Float3 position = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
vPositions.Add(position);
}
// uv coordinates
if (lineParts[0] == "vt")
{
Float2 uv = new Float2(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture));
uvs.Add(uv);
}
// normals
if (lineParts[0] == "vn")
{
Float3 normal = new Float3(float.Parse(lineParts[1], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[2], System.Globalization.CultureInfo.InvariantCulture),
float.Parse(lineParts[3], System.Globalization.CultureInfo.InvariantCulture)
);
normals.Add(normal);
}
if (lineParts[0] == "f")
{
string[] f1 = lineParts[1].Split('/');
string[] f2 = lineParts[2].Split('/');
string[] f3 = lineParts[3].Split('/');
int v1 = int.Parse(f1[0]);
int v2 = int.Parse(f2[0]);
int v3 = int.Parse(f3[0]);
int t1 = -1;
int t2 = -1;
int t3 = -1;
// if texture coordinates specified
if (f1.Length > 1)
{
if (!string.IsNullOrEmpty(f1[1]))
t1 = int.Parse(f1[1]);
if (!string.IsNullOrEmpty(f2[1]))
t2 = int.Parse(f2[1]);
if (!string.IsNullOrEmpty(f3[1]))
t3 = int.Parse(f3[1]);
}
int n1 = 0, n2 = 0, n3 = 0;
// if normals specified
if (f1.Length > 2) {
n1 = int.Parse(f1[2]);
n2 = int.Parse(f2[2]);
n3 = int.Parse(f3[2]);
}
wTriangles.Add(new WObjTriangle(v1, v2, v3, n1, n2, n3, t1, t2, t3));
result.Triangles.Add(new Triangle(v1, v2, v3));
}
}
result.Vertices = new List<Vertex>();
for(int i = 0; i < vPositions.Count; i++)
{
result.Vertices.Add(new Vertex(vPositions[i]));
}
for(int i = 0; i < wTriangles.Count; i++)
{
WObjTriangle wTriangle = wTriangles[i];
Vertex v1 = result.Vertices[wTriangle.v1 - 1];
Vertex v2 = result.Vertices[wTriangle.v2 - 1];
Vertex v3 = result.Vertices[wTriangle.v3 - 1];
if(normals.Count > 0)
{
v1.normal = normals[wTriangle.n1 - 1];
v2.normal = normals[wTriangle.n2 - 1];
v3.normal = normals[wTriangle.n3 - 1];
}
if (uvs.Count > 0)
{
if (wTriangle.uv1 < 0 || wTriangle.uv2 < 0 || wTriangle.uv3 < 0)
continue;
v1.uv = uvs[wTriangle.uv1 - 1];
v2.uv = uvs[wTriangle.uv2 - 1];
v3.uv = uvs[wTriangle.uv3 - 1];
}
}
return result;
}
