public Material()
{
Color = new RtColor(1, 1, 1);
Ambient = 0.1;
Diffuse = 0.9;
Specular = 0.9;
Shininess = 200.0;
}
public Canvas(int width, int height, RtColor background)
{
Width = width;
Height = height;
canvas = new RtColor[width, height];
Clear(background);
}
private void Clear(RtColor RtColor)
{
for (int x = 0; x < Width; x++)
{
for (int y = 0; y < Height; y++)
{
canvas[x, y] = RtColor;
}
}
}
public AreaLight(RtPoint corner, RtVector uVector, int uSteps, RtVector vVector, int vSteps, RtColor intensity)
{
Corner = corner;
UVector = uVector / uSteps;
USteps = uSteps;
VVector = vVector / vSteps;
VSteps = vSteps;
Intensity = intensity;
var middle = (uVector / 2) + (vVector / 2);
Position = new RtPoint(middle.X, middle.Y, middle.Z);
Samples = uSteps * vSteps;
}
public RtColor Lighting(Computations computations, Light light, double intensity)
{
var color = Color;
if (Pattern != null)
{
color = Pattern.PatternAtShape(computations.Shape, computations.OverPosition);
}
var effectiveColor = color * light.Intensity;
var ambient = effectiveColor * Ambient;
// var lightPosition = light.Position;
RtColor sum = RtColor.Black;
foreach (var lightPosition in light.GetSamples())
{
var lightVector = (lightPosition - computations.Position).Normalize();
var lightDotNormal = lightVector.Dot(computations.NormalVector);
if (lightDotNormal < 0 || intensity == 0)
{
continue;
}
sum += effectiveColor * Diffuse * lightDotNormal;
var reflectVector = lightVector.Negate().Reflect(computations.NormalVector);
var reflectDotEye = reflectVector.Dot(computations.EyeVector);
if (reflectDotEye > 0)
{
var factor = Math.Pow(reflectDotEye, Shininess);
sum += light.Intensity * Specular * factor;
}
}
var results = ambient + (sum / light.Samples) * intensity;
return(results);
}
public GradientPattern(RtColor white, RtColor black)
{
ColorB = black;
ColorA = white;
}
public StripePattern(RtColor colorA, RtColor colorB)
{
ColorA = colorA;
ColorB = colorB;
}
public PointLight(RtPoint position, RtColor color)
{
Position = position;
Intensity = color;
Samples = 1;
}
public GradientRingPattern(RtColor colorA1, RtColor colorA2, RtColor colorB)
{
ColorA1 = colorA1;
ColorA2 = colorA2;
ColorB = colorB;
}
public RingPattern(RtColor colorA, RtColor colorB)
{
ColorA = colorA;
ColorB = colorB;
}
public CheckersPattern(RtColor colorA, RtColor colorB)
{
ColorB = colorB;
ColorA = colorA;
}