public void DrawTriangle(ColorRGB color, VertexBuffer vbx, int triangleIndice)
{
vbx.Volume.Triangles[triangleIndice].TransformWorld(vbx);
var surface = RendererContext.Surface;
PainterUtils.SortTrianglePoints(vbx, surface, triangleIndice, out var v0, out var v1, out var v2);
var p0 = v0.ScreenPoint; var p1 = v1.ScreenPoint; var p2 = v2.ScreenPoint;
var yStart = (int)Math.Max(p0.Y, 0);
var yEnd = (int)Math.Min(p2.Y, surface.Height - 1);
// Out if clipped
if (yStart > yEnd)
{
return;
}
var yMiddle = MathUtils.Clamp((int)p1.Y, yStart, yEnd);
// This has to move elsewhere
var lightPos = new Vector3(0, 10, 10);
// computing the cos of the angle between the light vector and the normal vector
// it will return a value between 0 and 1 that will be used as the intensity of the color
var nl0 = MathUtils.ComputeNDotL(v0.WorldPoint, v0.WorldNormal, lightPos);
var nl1 = MathUtils.ComputeNDotL(v1.WorldPoint, v1.WorldNormal, lightPos);
var nl2 = MathUtils.ComputeNDotL(v2.WorldPoint, v2.WorldNormal, lightPos);
if (PainterUtils.Cross2D(p0, p1, p2) > 0)
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p2, p0, p1, nl0, nl2, nl0, nl1);
paintHalfTriangle((int)yMiddle, yEnd, color, p0, p2, p1, p2, nl0, nl2, nl1, nl2);
}
else
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p1, p0, p2, nl0, nl1, nl0, nl2);
paintHalfTriangle((int)yMiddle, yEnd, color, p1, p2, p0, p2, nl1, nl2, nl0, nl2);
}
}
public void DrawTriangle(ColorRGB color, VertexBuffer vbx, int triangleIndice)
{
vbx.Volume.Triangles[triangleIndice].TransformWorld(vbx);
var surface = RendererContext.Surface;
PainterUtils.SortTrianglePoints(vbx, surface, triangleIndice, out var v0, out var v1, out var v2);
var p0 = v0.ScreenPoint; var p1 = v1.ScreenPoint; var p2 = v2.ScreenPoint;
var yStart = (int)Math.Max(p0.Y, 0);
var yEnd = (int)Math.Min(p2.Y, surface.Height - 1);
// Out if clipped
if (yStart > yEnd)
{
return;
}
var yMiddle = MathUtils.Clamp((int)p1.Y, yStart, yEnd);
var lightPos = new Vector3(0, 10, 10);
var vertexNormal = (v0.WorldNormal + v1.WorldNormal + v2.WorldNormal) / 3;
var vertexCenter = (v0.WorldPoint + v1.WorldPoint + v2.WorldPoint) / 3;
color = MathUtils.ComputeNDotL(vertexCenter, vertexNormal, lightPos) * color;
if (PainterUtils.Cross2D(p0, p1, p2) > 0)
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p2, p0, p1);
paintHalfTriangle((int)yMiddle, yEnd, color, p0, p2, p1, p2);
}
else
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p1, p0, p2);
paintHalfTriangle((int)yMiddle, yEnd, color, p1, p2, p0, p2);
}
}
public void DrawTriangle(ColorRGB color, VertexBuffer vbx, int triangleIndice)
{
var surface = RendererContext.Surface;
PainterUtils.SortTrianglePoints(vbx, surface, triangleIndice, out var v0, out var v1, out var v2);
var p0 = v0.ScreenPoint; var p1 = v1.ScreenPoint; var p2 = v2.ScreenPoint;
var yStart = (int)Math.Max(p0.Y, 0);
var yEnd = (int)Math.Min(p2.Y, surface.Height - 1);
// Out if clipped
if (yStart > yEnd)
{
return;
}
var yMiddle = MathUtils.Clamp((int)p1.Y, yStart, yEnd);
if (PainterUtils.Cross2D(p0, p1, p2) > 0)
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p2, p0, p1);
paintHalfTriangle((int)yMiddle, yEnd, color, p0, p2, p1, p2);
}
else
{
// P0
// P1
// P2
paintHalfTriangle(yStart, (int)yMiddle - 1, color, p0, p1, p0, p2);
paintHalfTriangle((int)yMiddle, yEnd, color, p1, p2, p0, p2);
}
}