Triangle GetTriangleInPerspective(Triangle triangle, float focalLength)
{
Matrix4x4 h = Transformations.CreatePerspectiveMatrix(focalLength);
return(Triangle.MultiplyTriangleByMatrix(triangle, h));
}
public PaintingCanvas PaintRedGreenTriangles(Triangle redTriangle, Triangle greenTriangle)
{
// Canvas settings
const int width = 360;
const int height = 360;
const float pixelSize = 0.01f;
// Camera settings
const float yOffset = 10;
const float focalLength = 5;
// Transform the triangles for the camera's perspective
Triangle perspectiveRedTriangle = GetTriangleInPerspective(redTriangle, focalLength);
Triangle perspectiveGreenTriangle = GetTriangleInPerspective(greenTriangle, focalLength);
// Triangle shadows
PaintingCanvas t1Shadow = GetTriangleShadow(perspectiveRedTriangle, width, height);
PaintingCanvas t2Shadow = GetTriangleShadow(perspectiveGreenTriangle, width, height);
Plane plane1 = new Plane(redTriangle);
Plane plane2 = new Plane(greenTriangle);
double[,] zBuffer = new double[width, height];
FillBuffer(zBuffer, 1000000);
PaintingCanvas trianglesCanvas = PaintingCanvas.CreateInstance(width, height);
for (int i = 0; i < trianglesCanvas.Height; i++)
{
float y = (trianglesCanvas.Height / 2 - i) * pixelSize;
for (int j = 0; j < trianglesCanvas.Width; j++)
{
float x = (j - trianglesCanvas.Width / 2) * pixelSize;
// Draw triangle 1
if (t1Shadow.IsPixelColored(i, j))
{
Point cameraPoint = new Point(x, yOffset, y);
Vector3 line = new Vector3(-x, 1, -y);
double d = plane1.DistanceToPlane(cameraPoint, line);
if (d < zBuffer[i, j])
{
zBuffer[i, j] = d;
trianglesCanvas.DrawPixel(i, j, Colors.Red);
}
}
// Draw triangle 2
if (t2Shadow.IsPixelColored(i, j))
{
Point cameraPoint = new Point(x, yOffset, y);
Vector3 line = new Vector3(-x, 1, -y);
double d = plane2.DistanceToPlane(cameraPoint, line);
if (d < zBuffer[i, j])
{
zBuffer[i, j] = d;
trianglesCanvas.DrawPixel(i, j, Colors.Lime);
}
}
}
}
trianglesCanvas.Save();
return(trianglesCanvas);
}