public static Vec3D VectorNormalise(Vec3D v)
{
float l = VectorLength(v);
return(new Vec3D {
x = v.x / l, y = v.y / l, z = v.z / l
});
}
private void Render(object sender, EventArgs e)
{
PainterHelper.ClearScreen(bm);
camera.vForward = Vec3D.VectorMul(camera.vLookDir, 0.05F);
List <Triangle> trianglesToRaster = new List <Triangle>();
Matrix matView = camera.RotateCamera();
foreach (var tri in scene.triangles)
{
Triangle triProjected, triTransformed, triViewed;
triViewed = new Triangle(3);
triTransformed = Triangle.TransformTriangle(tri, transformations.matWorld);
Vec3D vCameraRay = Vec3D.VectorSub(triTransformed.points[0], camera.vCamera);
if (Vec3D.VectorDotProduct(triTransformed.Normal, vCameraRay) < 0.0F)
{
float lightIntensity = light.GetLightIntensityForSurface(triTransformed.Normal);
Color color = PainterHelper.ChangeColorBrightness(Color.Black, lightIntensity);
triViewed = Triangle.TransformTriangle(triTransformed, matView);
triProjected = Triangle.ProjectTriangle(transformations.matProj, triViewed);
triProjected.InvertXAndY();
//// Scale into view
Vec3D vOffsetView = new Vec3D {
x = 1, y = 1, z = 0
};
triProjected.Offset(vOffsetView, bm);
triProjected.color = color;
triProjected.zTotal = (triProjected.points[0].z + triProjected.points[1].z + triProjected.points[2].z) / 3.0F;
trianglesToRaster.Add(triProjected);
}
}
trianglesToRaster.Sort((p, q) => q.zTotal.CompareTo(p.zTotal));
foreach (var triangle in trianglesToRaster)
{
PainterHelper.DrawTriangle(triangle, bm);
pictureBoxCanvas.Image = bm;
}
}
public static Vec3D VectorCrossProduct(Vec3D v1, Vec3D v2)
{
Vec3D v = new Vec3D();
v.x = v1.y * v2.z - v1.z * v2.y;
v.y = v1.z * v2.x - v1.x * v2.z;
v.z = v1.x * v2.y - v1.y * v2.x;
return(v);
}
public static Vec3D MatrixMultiplyVector(Vec3D i, Matrix m)
{
Vec3D v;
v = new Vec3D();
v.x = i.x * m.matrix[0, 0] + i.y * m.matrix[1, 0] + i.z * m.matrix[2, 0] + i.w * m.matrix[3, 0];
v.y = i.x * m.matrix[0, 1] + i.y * m.matrix[1, 1] + i.z * m.matrix[2, 1] + i.w * m.matrix[3, 1];
v.z = i.x * m.matrix[0, 2] + i.y * m.matrix[1, 2] + i.z * m.matrix[2, 2] + i.w * m.matrix[3, 2];
v.w = i.x * m.matrix[0, 3] + i.y * m.matrix[1, 3] + i.z * m.matrix[2, 3] + i.w * m.matrix[3, 3];
return(v);
}
public Camera()
{
vCamera = new Vec3D();
vLookDir = new Vec3D();
vForward = new Vec3D();
vUp = new Vec3D {
x = 0, y = 1, z = 0
};
vTarget = new Vec3D {
x = 0, y = 0, z = 1
};
}
public void Offset(Vec3D vOffsetView, Bitmap bm)
{
points[0] = Vec3D.VectorAdd(points[0], vOffsetView);
points[1] = Vec3D.VectorAdd(points[1], vOffsetView);
points[2] = Vec3D.VectorAdd(points[2], vOffsetView);
points[0].x *= 0.5F * (float)bm.Width;
points[0].y *= 0.5F * (float)bm.Height;
points[1].x *= 0.5F * (float)bm.Width;
points[1].y *= 0.5F * (float)bm.Height;
points[2].x *= 0.5F * (float)bm.Width;
points[2].y *= 0.5F * (float)bm.Height;
}
public static Triangle ProjectTriangle(Matrix matProj, Triangle triToProject)
{
Triangle triProjected = new Triangle(3);
triProjected.points[0] = Matrix.MatrixMultiplyVector(triToProject.points[0], matProj);
triProjected.points[1] = Matrix.MatrixMultiplyVector(triToProject.points[1], matProj);
triProjected.points[2] = Matrix.MatrixMultiplyVector(triToProject.points[2], matProj);
triProjected.points[0] = Vec3D.VectorDiv(triProjected.points[0], triProjected.points[0].w);
triProjected.points[1] = Vec3D.VectorDiv(triProjected.points[1], triProjected.points[1].w);
triProjected.points[2] = Vec3D.VectorDiv(triProjected.points[2], triProjected.points[2].w);
return(triProjected);
}
public Matrix RotateCamera()
{
vTarget = new Vec3D {
x = 0, y = 0, z = 1
};
Matrix matCameraRot = Matrix.Matrix_MakeRotationY(fYaw);
vLookDir = Matrix.MatrixMultiplyVector(vTarget, matCameraRot);
vTarget = Vec3D.VectorAdd(vCamera, vLookDir);
Matrix matCamera = Matrix.Matrix_PointAt(vCamera, vTarget, vUp);
Matrix matView = Matrix.Matrix_QuickInverse(matCamera);
return(matView);
}
public Mesh(string sFileName)
{
List <Vec3D> verts = new List <Vec3D>();
triangles = new List <Triangle>();
using (StreamReader sr = new StreamReader(sFileName))
{
string line = sr.ReadLine();
while (!String.IsNullOrEmpty(line))
{
if (line[0] == 'v')
{
Vec3D vect;
vect = new Vec3D();
string[] parts = line.Split(' ');
vect.x = float.Parse(parts[1], CultureInfo.InvariantCulture.NumberFormat);
vect.y = float.Parse(parts[2], CultureInfo.InvariantCulture.NumberFormat);
vect.z = float.Parse(parts[3], CultureInfo.InvariantCulture.NumberFormat);
verts.Add(vect);
}
if (line[0] == 'f')
{
int[] f = new int[3];
string[] parts = line.Split(' ');
f[0] = Convert.ToInt32(parts[1]);
f[1] = Convert.ToInt32(parts[2]);
f[2] = Convert.ToInt32(parts[3]);
triangles.Add(new Triangle {
points = new Vec3D[] { verts[f[0] - 1], verts[f[1] - 1], verts[f[2] - 1] }
});
}
line = sr.ReadLine();
}
}
}
public void MoveCamera(Keys key)
{
if (key == Keys.Up)
{
vCamera.y += 0.05F;
}
if (key == Keys.Down)
{
vCamera.y -= 0.05F;
}
if (key == Keys.Left)
{
vCamera.x += 0.05F;
}
if (key == Keys.Right)
{
vCamera.x -= 0.05F;
}
if (key == Keys.W)
{
vCamera = Vec3D.VectorAdd(vCamera, vForward);
}
if (key == Keys.S)
{
vCamera = Vec3D.VectorSub(vCamera, vForward);
}
if (key == Keys.A)
{
fYaw -= 0.05F;
}
if (key == Keys.D)
{
fYaw += 0.05F;
}
}
public static Matrix Matrix_PointAt(Vec3D pos, Vec3D target, Vec3D up)
{
Vec3D newForward = Vec3D.VectorSub(target, pos);
newForward = Vec3D.VectorNormalise(newForward);
Vec3D a = Vec3D.VectorMul(newForward, Vec3D.VectorDotProduct(up, newForward));
Vec3D newUp = Vec3D.VectorSub(up, a);
newUp = Vec3D.VectorNormalise(newUp);
Vec3D newRight = Vec3D.VectorCrossProduct(newUp, newForward);
Matrix matrix = new Matrix(4);
matrix.matrix[0, 0] = newRight.x; matrix.matrix[0, 1] = newRight.y; matrix.matrix[0, 2] = newRight.z; matrix.matrix[0, 3] = 0.0f;
matrix.matrix[1, 0] = newUp.x; matrix.matrix[1, 1] = newUp.y; matrix.matrix[1, 2] = newUp.z; matrix.matrix[1, 3] = 0.0f;
matrix.matrix[2, 0] = newForward.x; matrix.matrix[2, 1] = newForward.y; matrix.matrix[2, 2] = newForward.z; matrix.matrix[2, 3] = 0.0f;
matrix.matrix[3, 0] = pos.x; matrix.matrix[3, 1] = pos.y; matrix.matrix[3, 2] = pos.z; matrix.matrix[3, 3] = 1.0f;
return(matrix);
}
public static Vec3D VectorMul(Vec3D v1, float k)
{
return(new Vec3D {
x = v1.x * k, y = v1.y * k, z = v1.z * k
});
}
public float GetLightIntensityForSurface(Vec3D surfaceNormal)
{
float intensity = (float)Math.Max(0.1f, Vec3D.VectorDotProduct(lightDirection, surfaceNormal));
return(intensity);
}
public Light(Vec3D lightDirection)
{
this.lightDirection = lightDirection;
this.lightDirection = Vec3D.VectorNormalise(lightDirection);
}
public static Vec3D VectorSub(Vec3D v1, Vec3D v2)
{
return(new Vec3D {
x = v1.x - v2.x, y = v1.y - v2.y, z = v1.z - v2.z
});
}
public static Vec3D VectorAdd(Vec3D v1, Vec3D v2)
{
return(new Vec3D {
x = v1.x + v2.x, y = v1.y + v2.y, z = v1.z + v2.z
});
}
public static Vec3D VectorDiv(Vec3D v1, float k)
{
return(new Vec3D {
x = v1.x / k, y = v1.y / k, z = v1.z / k
});
}
public static float VectorDotProduct(Vec3D v1, Vec3D v2)
{
return(v1.x * v2.x + v1.y * v2.y + v1.z * v2.z);
}
public static float VectorLength(Vec3D v)
{
return((float)Math.Sqrt(VectorDotProduct(v, v)));
}
