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 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 float GetLightIntensityForSurface(Vec3D surfaceNormal)
{
float intensity = (float)Math.Max(0.1f, Vec3D.VectorDotProduct(lightDirection, surfaceNormal));
return(intensity);
}