public override void Process(SceneReaderContext context)
{
context.VerifyWorld("ObjectInstance");
if (context.RenderOptions.CurrentInstance != null)
throw new InvalidOperationException("ObjectInstance can't be called inside instance definition.");
if (!context.RenderOptions.Instances.ContainsKey(Name))
throw new InvalidOperationException("Unable to find instance named '" + Name + "'.");
var instances = context.RenderOptions.Instances[Name];
if (instances.Count == 0)
return;
if (instances.Count > 1 || !instances[0].CanIntersect)
{
// Refine instance primitives and create aggregate.
var accelerator = Factories.MakeAccelerator(
context.RenderOptions.AcceleratorName,
context.RenderOptions.AcceleratorParams,
instances);
instances.Clear();
instances.Add(accelerator);
}
var worldToInstance0 = Transform.Invert(context.CurrentTransform[0]);
var worldToInstance1 = Transform.Invert(context.CurrentTransform[1]);
var animatedWorldToInstance = new AnimatedTransform(
worldToInstance0, context.RenderOptions.TransformStartTime,
worldToInstance1, context.RenderOptions.TransformEndTime);
context.RenderOptions.Primitives.Add(new TransformedPrimitive(
instances[0], animatedWorldToInstance));
}
public static Camera MakeCamera(string name, ParamSet parameters,
TransformSet cameraToWorldSet, float transformStart, float transformEnd,
Film film)
{
var animatedCameraToWorld = new AnimatedTransform(
cameraToWorldSet[0], transformStart,
cameraToWorldSet[1], transformEnd);
switch (name)
{
case "perspective" :
{
var shutterOpen = parameters.FindSingle("shutteropen", 0.0f);
var shutterClose = parameters.FindSingle("shutterclose", 1.0f);
if (shutterOpen < shutterClose)
MathUtility.Swap(ref shutterOpen, ref shutterClose);
var lensRadius = parameters.FindSingle("lensradius", 0.0f);
var focalDistance = parameters.FindSingle("focaldistance", 1e30f);
var frame = parameters.FindSingle("frameaspectratio", film.XResolution / (float) film.YResolution);
var screenWindow = parameters.FindSingleList("screenwindow");
if (screenWindow.Length != 4)
screenWindow = (frame > 1.0f)
? new[] { -frame, frame, -1, 1 }
: new[] { -1, 1, -1 / frame, 1 / frame };
var fieldOfView = parameters.FindSingle("fov", 90.0f);
return new PerspectiveCamera(animatedCameraToWorld, screenWindow, shutterOpen, shutterClose,
lensRadius, focalDistance, fieldOfView, film);
}
default :
throw new ArgumentException("Unknown camera: " + name);
}
}
protected Camera(AnimatedTransform cameraToWorld,
float shutterOpen, float shutterClose,
Film film)
{
_cameraToWorld = cameraToWorld;
_shutterOpen = shutterOpen;
_shutterClose = shutterClose;
_film = film;
}
public PerspectiveCamera(
AnimatedTransform cameraToWorld, float[] screenWindow,
float shutterOpen, float shutterClose,
float lensRadius, float focalDistance,
float fieldOfView,
Film film)
: base(cameraToWorld, Transform.Perspective(fieldOfView, 1e-2f, 1000.0f), screenWindow, shutterOpen, shutterClose, lensRadius, focalDistance, film)
{
// Compute differential changes in origin for perspective camera rays
_dxCamera = RasterToCamera.TransformPoint(new Point(1, 0, 0)) - RasterToCamera.TransformPoint(new Point(0, 0, 0));
_dyCamera = RasterToCamera.TransformPoint(new Point(0, 1, 0)) - RasterToCamera.TransformPoint(new Point(0, 0, 0));
}
protected ProjectiveCamera(AnimatedTransform cameraToWorld, Transform cameraToScreen,
float[] screenWindow, float shutterOpen, float shutterClose,
float lensRadius, float focalDistance, Film film)
: base(cameraToWorld, shutterOpen, shutterClose, film)
{
_cameraToScreen = cameraToScreen;
_lensRadius = lensRadius;
_focalDistance = focalDistance;
// Compute projective camera screen transformations
_screenToRaster = Transform.Scale(film.XResolution, film.YResolution, 1.0f)
* Transform.Scale(1.0f / (screenWindow[1] - screenWindow[0]), 1.0f / (screenWindow[2] - screenWindow[3]), 1.0f)
* Transform.Translate(new Vector(-screenWindow[0], -screenWindow[3], 0.0f));
_rasterToScreen = Transform.Invert(_screenToRaster);
_rasterToCamera = Transform.Invert(_cameraToScreen) * _rasterToScreen;
}
public TransformedPrimitive(Primitive primitive, AnimatedTransform worldToPrimitive)
{
_primitive = primitive;
_worldToPrimitive = worldToPrimitive;
}
private void ProcessShape(SceneReaderContext context)
{
Primitive prim = null;
AreaLight area = null;
if (!context.CurrentTransform.IsAnimated)
{
// Create primitive for static shape.
var shape = Factories.MakeShape(ImplementationType,
context.CurrentTransform[0], context.GraphicsState.ReverseOrientation,
Parameters);
var material = context.GraphicsState.CreateMaterial(
Parameters, context.CurrentTransform[0]);
// Possibly create area light for shape.
if (!string.IsNullOrEmpty(context.GraphicsState.AreaLight))
area = Factories.MakeAreaLight(
context.GraphicsState.AreaLight,
context.CurrentTransform[0],
context.GraphicsState.AreaLightParams,
shape);
prim = new GeometricPrimitive(shape, material, area);
}
else
{
// Create primitive for animated shape.
var shape = Factories.MakeShape(ImplementationType, new Transform(),
context.GraphicsState.ReverseOrientation, Parameters);
var material = context.GraphicsState.CreateMaterial(
Parameters, context.CurrentTransform[0]);
// Get animatedWorldToObject transform for shape.
var worldToObj0 = Transform.Invert(context.CurrentTransform[0]);
var worldToObj1 = Transform.Invert(context.CurrentTransform[1]);
var animatedWorldToObject = new AnimatedTransform(
worldToObj0, context.RenderOptions.TransformStartTime,
worldToObj1, context.RenderOptions.TransformEndTime);
Primitive basePrim = new GeometricPrimitive(shape, material, null);
if (!basePrim.CanIntersect)
{
// Refine animated shape and create BVH if more than one shape created.
var refinedPrimitives = basePrim.FullyRefine();
if (refinedPrimitives.Count == 0)
return;
basePrim = (refinedPrimitives.Count > 1)
? new BoundingVolumeHierarchyAccelerator(refinedPrimitives)
: refinedPrimitives[0];
}
prim = new TransformedPrimitive(basePrim, animatedWorldToObject);
}
// Add primitive to scene or current instance.
if (context.RenderOptions.CurrentInstance != null)
{
context.RenderOptions.CurrentInstance.Add(prim);
}
else
{
context.RenderOptions.Primitives.Add(prim);
if (area != null)
context.RenderOptions.Lights.Add(area);
}
}
