protected IConstantBuffer GetModelViewTransformBuffer(SceneNode root, ICameraNode cam)
{
Matrix4 invCamWorldTrans = cam != null ? (cam.GetInverseWorldTransform(root) ?? Matrix4.Identity) : Matrix4.Identity;
Dictionary <ICameraNode, ConstantBuffer <ModelViewTrans> > camToBufferMap = null;
if (!_modelViewTransformBuffers.ContainsKey(root))
{
camToBufferMap = new Dictionary <ICameraNode, ConstantBuffer <ModelViewTrans> >();
_modelViewTransformBuffers[root] = camToBufferMap;
}
else
{
camToBufferMap = _modelViewTransformBuffers[root];
}
ConstantBuffer <ModelViewTrans> cbuffer = null;
if (!camToBufferMap.ContainsKey(cam))
{
cbuffer = new ConstantBuffer <ModelViewTrans>();
camToBufferMap.Add(cam, cbuffer);
}
else
{
cbuffer = camToBufferMap[cam];
}
ModelViewTrans mvt = new ModelViewTrans();
mvt.ModelViewMatrix = invCamWorldTrans * (this.GetWorldTransform(root) ?? Matrix4.Identity);
if (cbuffer.Value.ModelViewMatrix != mvt.ModelViewMatrix)
{
mvt.NormalMatrix = mvt.ModelViewMatrix.NormalMatrix;
cbuffer.Value = mvt;
}
return(cbuffer);
}
public Image Render(ICameraNode camera, int sample, int max_depth)
{
bvh = new BVH(new List <IVisualNode>(visual_nodes));
if (sample < 1)
{
sample = 1;
}
Image image = new Image(camera.View.Width, camera.View.Height);
Vector2 half_size = new Vector2(camera.View.Width / 2.0f, camera.View.Height / 2.0f);
for (int y = 0; y < camera.View.Height; ++y)
{
for (int x = 0; x < camera.View.Width; ++x)
{
Vector2 uv = new Vector2((x - half_size.X) / half_size.X, (half_size.Y - y) / half_size.Y);
Vector3 color = Vector3.Zero;
for (int n = 0; n < sample; ++n)
{
Vector2 delta = new Vector2(MathHelper.RandomFloat() / camera.View.Width, MathHelper.RandomFloat() / camera.View.Height);
Vector2 new_uv = uv + delta;
Ray ray = camera.GetRay(new_uv.X, new_uv.Y);
color += Color(ray, 0, max_depth);
}
color /= sample;
image[x, y] = color;
}
}
return(image);
}
static void Main(string[] args)
{
ISceneGraph scene_graph = SceneGraphFactory.Create();
ITexture checker_texture = new CheckerTexture(new ConstantTexture(new Vector3(0.2f, 0.3f, 0.1f)), new ConstantTexture(new Vector3(0.9f, 0.9f, 0.9f)));
SphereNode sphere = scene_graph.AddShape(Shape.Sphere) as SphereNode;
sphere.Translation = new Vector3(0.0f, -1000.0f, 0.0f);
sphere.Material = new LambertianMaterial(checker_texture);
sphere.Radius = 1000.0f;
sphere = scene_graph.AddShape(Shape.Sphere) as SphereNode;
sphere.Translation = new Vector3(0.0f, 1.0f, 0.0f);
sphere.Material = new DielectricMaterial(1.5f);
sphere.Radius = 1.0f;
sphere = scene_graph.AddShape(Shape.Sphere) as SphereNode;
sphere.Translation = new Vector3(0.0f, 3.0f, 0.0f);
sphere.Material = new DiffuseLightMaterial(new ConstantTexture(new Vector3(3.0f, 3.0f, 3.0f)));
sphere.Radius = 1.0f;
sphere = scene_graph.AddShape(Shape.Sphere) as SphereNode;
sphere.Translation = new Vector3(-4.0f, 1.0f, 0.0f);
sphere.Material = new LambertianMaterial(new ConstantTexture(new Vector3(0.4f, 0.2f, 0.1f)));
sphere.Radius = 1.0f;
sphere = scene_graph.AddShape(Shape.Sphere) as SphereNode;
sphere.Translation = new Vector3(4.0f, 1.0f, 0.0f);
sphere.Material = new MetalMaterial(new ConstantTexture(new Vector3(0.7f, 0.6f, 0.5f)), 0.0f);
sphere.Radius = 1.0f;
for (int z = -10; z <= 10; ++z)
{
for (int x = -10; x <= 10; ++x)
{
float choose_material = MathHelper.RandomFloat();
Vector3 translation = new Vector3(x + 0.9f * MathHelper.RandomFloat(), 0.2f, z + 0.9f * MathHelper.RandomFloat());
if (Vector3.Distance(translation, new Vector3(4.0f, 0.2f, 0.0f)) > 0.9f)
{
SphereNode ball = scene_graph.AddShape(Shape.Sphere) as SphereNode;
ball.Translation = translation;
ball.Radius = 0.2f;
if (choose_material < 0.8f)
{
ball.Material = new LambertianMaterial(new ConstantTexture(new Vector3(MathHelper.RandomFloat() * MathHelper.RandomFloat(), MathHelper.RandomFloat() * MathHelper.RandomFloat(), MathHelper.RandomFloat() * MathHelper.RandomFloat())));
}
else if (choose_material < 0.95f)
{
ball.Material = new MetalMaterial(new ConstantTexture(new Vector3(1.0f + MathHelper.RandomFloat(), 1.0f + MathHelper.RandomFloat(), 1.0f + MathHelper.RandomFloat()) * 0.5f), 0.5f * MathHelper.RandomFloat());
}
else
{
ball.Material = new DielectricMaterial(1.5f);
}
}
}
}
ICameraNode camera = scene_graph.AddCamera();
camera.View.Width = 1200;
camera.View.Height = 800;
camera.SetProjection(20.0f);
camera.Translation = new Vector3(13.0f, 2.0f, 3.0f);
camera.Rotation = MathHelper.LookAt(camera.Translation, new Vector3(0.0f, 0.0f, 0.0f), new Vector3(0.0f, 1.0f, 0.0f));
Image image = scene_graph.Render(camera, 50, 50);
PPMImageSaver saver = new PPMImageSaver();
string path = args.Length > 0 ? args[0] : "output.ppm";
saver.Save(image, path);
}
