public Intersection(IPrimitive hitPrimitive, Point3D hitPoint, Vector3D normal, float tMin, float tMax,
bool hitFromInSide)
{
this.HitPoint = hitPoint;
this.Normal = normal;
this.TMin = tMin;
this.TMax = tMax;
this.HitPrimitive = hitPrimitive;
this.HitFromInSide = hitFromInSide;
this.CurrentTextureCoordinate = UVCoordinate.Zero;
}
public override void Deserialize(Stream input)
{
this.Version = input.ReadValueU32();
this.Name = input.ReadStringAlignedU8();
this.BillboardMode = new FourCC(input);
this.Rotation = new Vector4(input);
this.Colour = input.ReadValueU32();
this.Uv0 = new UVCoordinate(input);
this.Uv1 = new UVCoordinate(input);
this.Uv2 = new UVCoordinate(input);
this.Uv3 = new UVCoordinate(input);
this.Width = input.ReadValueF32();
this.Height = input.ReadValueF32();
this.Distance = input.ReadValueF32();
this.UVOffset = new UVCoordinate(input);
}
public static Vector3D BumpNormal(Texture bumpTexture, Intersection intersection)
{
const float scale = 1;
UVCoordinate uv = intersection.CurrentTextureCoordinate;
float dx = 1.0f / (bumpTexture.Width - 1);
float dy = 1.0f / (bumpTexture.Height - 1);
float b0 = bumpTexture.GetPixel(uv).Luminance;
float bx = bumpTexture.GetPixel(uv.U + dx, uv.V).Luminance;
float by = bumpTexture.GetPixel(uv.U, uv.V + dy).Luminance;
return((intersection.Normal + new Vector3D(scale * (bx - b0) / dx, scale * (by - b0) / dy, 1)).Normalized);
//RGBColor color = bumpTexture.GetPixel(uv);
//Vector3D tangent1, tangent2;
//Vector3D.Orthonormalize(intersection.Normal, out tangent1, out tangent2);
}
public override bool TryCalculateIntersection(Ray ray, out Intersection intersection)
{
intersection = new Intersection();
Vector3 rayToSphere = ray.Origin - this.Position;
float B = Vector3.Dot(rayToSphere, ray.Direction);
float C = Vector3.Dot(rayToSphere, rayToSphere) - (Radius * Radius);
float D = B * B - C;
if (D > 0)
{
var distance = -B - (float)Math.Sqrt(D);
var hitPosition = ray.Origin + (ray.Direction * new Vector3(distance));
var normal = hitPosition - this.Position;
UVCoordinate uv = this.GetUVCoordinate(hitPosition);
intersection = new Intersection(hitPosition, normal, ray.Direction, this, Material.GetDiffuseColorAtCoordinates(uv), distance);
return(true);
}
else
{
return(false);
}
}
/// <summary>
/// Returns the specular color of a material at the given UV coordinates.
/// </summary>
public Color GetSpecularColorAtCoordinates(UVCoordinate uv)
{
return(GetSpecularColorAtCoordinates(uv.U, uv.V));
}
/// <summary>
/// Returns the specular color of a material at the given UV coordinates.
/// </summary>
public Color GetDiffuseColorAtCoordinates(UVCoordinate uv)
{
return(GetDiffuseColorAtCoordinates(uv.U, uv.V));
}
//public static implicit operator Texture(Bitmap texture)
//{
// return new Texture(texture);
//}
//public void ProcessTextureImage(Bitmap texture)
//{
// textureMatrix = new RGBColor[texture.Width, texture.Height];
// for (int i = 0; i < texture.Width; i++)
// {
// for (int j = 0; j < texture.Height; j++)
// {
// textureMatrix[i, j] = RGBColor.FromColor(texture.GetPixel(i, j));
// }
// }
// texture.Dispose();
//}
public RGBColor GetPixel(UVCoordinate uv)
{
return(this.textureMatrix[(int)(uv.U * this.Width), (int)(uv.V * this.Height)]);
}
/// <summary>
/// Returns the specular color of a material at the given UV coordinates.
/// </summary>
public Color GetSpecularColorAtCoordinates(UVCoordinate uv)
{
return GetSpecularColorAtCoordinates(uv.U, uv.V);
}
/// <summary>
/// Returns the specular color of a material at the given UV coordinates.
/// </summary>
public Color GetDiffuseColorAtCoordinates(UVCoordinate uv)
{
return GetDiffuseColorAtCoordinates(uv.U, uv.V);
}
