Failure in geometry.h:242

[pengsongyou]

I am trying to render the subusrface-spheres from pbrt-v3-scene. The .pbrt is like below:

Film "image" "integer xresolution" [240] "integer yresolution" [180]

Sampler "random" "integer pixelsamples" [1024]

LookAt 0 -6 3  0 0 0  0 0 1
Camera "perspective" "float fov" 40

Integrator "path"

WorldBegin

AttributeBegin
Rotate 90 0 0 1
Rotate -90 1 0 0
LightSource "infinite" "string mapname"
    "20060807_wells6_hd.exr"   "color scale" [2.5 2.5 2.5]
AttributeEnd

Translate .4 0 0

AttributeBegin
Translate -2.1 0 0
Material "subsurface" "string name" "Ketchup"
   "float uroughness" [0.05] "float vroughness" [0.05]
   "bool remaproughness" ["false"]
Shape "sphere" "float radius" 1
AttributeEnd

AttributeBegin
# front left
Translate .25 -.5 0
Material "subsurface" "string name" "Apple"
   "float uroughness" [0.05] "float vroughness" [0.05]
   "bool remaproughness" ["false"]
Shape "sphere" "float radius" 1
AttributeEnd

AttributeBegin
Translate -1 3 0
# back rightn
Material "subsurface" "string name" "Skin1"
   "float uroughness" [0.05] "float vroughness" [0.05]
   "bool remaproughness" ["false"]
Shape "sphere" "float radius" 1
AttributeEnd

AttributeBegin
Translate 2 2.25 0
# back left
Material "subsurface" "string name" "Coke"
   "float uroughness" [0.05] "float vroughness" [0.05]
   "bool remaproughness" ["false"]
Shape "sphere" "float radius" 1
AttributeEnd

AttributeBegin
Material "plastic" "color Kd" [.1 .1 .1]
  "color Ks" [.7 .7 .7] "float roughness" .1
Translate 0 0 -1
Shape "trianglemesh"
   "point P" [ -30 -30 0   30 -30 0   30 30 0 -30 30 0 ]
   "float uv" [ 0 0 1 0 1 1 0 1 ]
    "integer indices" [ 0 1 2 2 3 0]
AttributeEnd

WorldEnd

However, in the middle of rendering using pbrt, I got the error:

Rendering: [++++++++++++++++++               ]  (183.1s|149.8s)  F1108 12:39:00.385815 54763520 geometry.h:242] Check failed: f != 0 (0 vs. 0) 
*** Check failure stack trace: ***
    @        0x100225d51  google::LogMessage::Flush()
    @        0x100229c03  google::LogMessageFatal::~LogMessageFatal()
    @        0x1002266e9  google::LogMessageFatal::~LogMessageFatal()
    @        0x10017f3a1  Vector3<>::operator/<>()
    @        0x10002d69d  SurfaceInteraction::SurfaceInteraction()
    @        0x1001893e0  Triangle::Intersect()
    @        0x1000db5dd  GeometricPrimitive::Intersect()
    @        0x100126a94  BVHAccel::Intersect()
    @        0x100022275  SeparableBSSRDF::Sample_Sp()
    @        0x100021a08  SeparableBSSRDF::Sample_S()
    @        0x100145aff  PathIntegrator::Li()
    @        0x10002c8fa  std::__1::__function::__func<>::operator()()
    @        0x1000cda4d  workerThreadFunc()
    @        0x1000ce781  _ZNSt3__114__thread_proxyINS_5tupleIJPFviEiEEEEEPvS5_
    @     0x7fff8913e05a  _pthread_body
    @     0x7fff8913dfd7  _pthread_start
Abort trap 6

It works well when the pixelsamples is 512 or less, but when it is 1024, pbrt stops working.

Do you have any idea what happens here? Thank you very much!

[mmp]

Thanks for reporting this! It was an interesting bug to track down; it eventually led to a ">" test that should have been ">=". Should be fixed now.