small corrections

Author: SimonDanisch

src/camera/perspective.jl

@@ -95,7 +95,7 @@ end
         # Sample points on lens.
         p_lens = camera.core.lens_radius * concentric_sample_disk(sample.lens)
         # Compute point on plane of focus.
-        t = camera.core.focal_distance / [3]
+        t = camera.core.focal_distance / d[3]
         p_focus = o .+ d * t
         # Update ray for effects of lens.
         o = Point3f(p_lens[1], p_lens[2], 0f0)

src/integrators/sampler.jl

@@ -93,7 +93,7 @@ function li(
     wo = core.wo
     # Compute scattering functions for surface interaction.
     si, bsdf = compute_scattering!(primitive, si, ray)
-    if bsdf.bxdfs.last == 0
+    if isnan(bsdf.η) # TODO, better way to return "nothing" BSDFs
         return li(
             i, RayDifferentials(spawn_ray(si, ray.d)),
             scene, depth,

src/materials/bsdf.jl

@@ -53,7 +53,7 @@ struct BSDF{S}
     bxdfs::BXDFVector{S}
 end
 
-BSDF() = BSDF{RGBSpectrum}(0f0, Normal3f(0f0), Normal3f(0f0), Vec3f(0f0), Vec3f(0f0), BXDFVector{RGBSpectrum}())
+BSDF() = BSDF{RGBSpectrum}(NaN32, Normal3f(0f0), Normal3f(0f0), Vec3f(0f0), Vec3f(0f0), BXDFVector{RGBSpectrum}())
 
 
 function BSDF(si::SurfaceInteraction, sbdfs::Vararg{UberBxDF{S}, N}) where {S<:Spectrum, N}