[BUG][UNIX]

[anshuman-mehta]

Summary

POV-Ray Version

• Incarnation: POV-Ray for Unix
• Affected build version: POV-Ray 3.8.0-alpha.unofficial

Runtime Environment

• Operating system: Ubuntu 24.04.3
• Hardware architecture: x86-64
• CPU model: Intel® Core™ i7-14700F

Steps to Reproduce

1. Clone the master branch
2. Follow the compile for unix/linux steps mentioned in README.md
3. Create a sample .pov file with

#version 3.7;
#include "colors.inc"

global_settings { assumed_gamma 1.0 }

background { color rgb <0.7, 0.8, 1.0> }

// --------------------------------------------------
// Camera
// --------------------------------------------------
camera {
  perspective
  location <0, 2, -5>
  look_at  <0, 1, 0>
  angle 40       // must be less than 180
}

// --------------------------------------------------
// Light source
// --------------------------------------------------
light_source {
  <5, 10, -5>
  color rgb <1, 1, 1>
}

// --------------------------------------------------
// Floor plane
// --------------------------------------------------
plane {
  <0, 1, 0>, 0
  texture {
    pigment { color rgb <0.8, 0.8, 0.8> }
    finish { diffuse 0.8 reflection 0.1 }
  }
}

// --------------------------------------------------
// Red sphere
// --------------------------------------------------
sphere {
  <0, 1, 0>, 1
  texture {
    pigment { color Red }
    finish { phong 0.7 }
  }
}

4. Execute the povray command
   povray test_simple.pov +W800 +H600 +A +FN +V

Command Line

Details

povray test_simple.pov +W800 +H600 +A +FN +V

Expected Behavior

Expected to see a red sphere

Actual Behavior

Blank blue color with no objects

Output

Details

==== [Parsing...] ==========================================================
----------------------------------------------------------------------------
Parser Statistics
----------------------------------------------------------------------------
Finite Objects:            1
Infinite Objects:          1
Light Sources:             1
Total:                     3
----------------------------------------------------------------------------
Parser Time
  Parse Time:       0 hours  0 minutes  0 seconds (0.003 seconds)
              using 1 thread(s) with 0.002 CPU-seconds total
  Bounding Time:    0 hours  0 minutes  0 seconds (0.000 seconds)
              using 1 thread(s) with 0.000 CPU-seconds total
----------------------------------------------------------------------------
Render Options
  Quality:  9
  Bounding boxes.......On   Bounding threshold: 3
  Antialiasing.........On  (Method 1, Threshold 0.300, Depth 3, Jitter 1.00,
 Gamma 2.50)
==== [Rendering... Press p to pause, q to quit] ============================
Rendered 480000 of 480000 pixels (100%)
----------------------------------------------------------------------------
Render Statistics
Image Resolution 800 x 600
----------------------------------------------------------------------------
Pixels:           510200   Samples:               0   Smpls/Pxl: 0.00
Rays:             510200   Saved:                 0   Max Level: 1/5
----------------------------------------------------------------------------
Ray->Shape Intersection          Tests       Succeeded  Percentage
----------------------------------------------------------------------------
Plane                           510200               0      0.00
Bounding Box                    510200               0      0.00
----------------------------------------------------------------------------
----------------------------------------------------------------------------
----------------------------------------------------------------------------
Render Time:
  Photon Time:      No photons
  Radiosity Time:   No radiosity
  Trace Time:       0 hours  0 minutes  0 seconds (0.017 seconds)
              using 28 thread(s) with 0.120 CPU-seconds total
POV-Ray finished

Is the latest build not producing output as intended? Please let me know if I am making any mistakes in executing.

[wfpokorny]

I suspect your issue is related to #460 - specifically changes in -ffast-math defaults with more recent compiler versions. The unix builds uses -ffast-math by default. The failure modes are varied, but yours is one which has been seen.

The workarounds are:

Don't use -ffast-math.

or

If you do use -ffast-math, you must use also specify the compiler flag -fno-finite-math-only.