The Persistence of Vision Raytracer (POV-Ray).

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Attached to Project: POV-Ray
Opened by Andrey Zholos - 2011-05-19
Last edited by Christoph Lipka - 2012-06-21

FS#203 - Radiosity artifacts at low error_bound

A scene of a hollow sphere viewed from the inside:

difference {
    sphere { 0, 100 }
    sphere { 0, 99 }
    pigment { rgb 1 }
    finish { ambient .4 }

global_settings {
    radiosity {
        error_bound .1

Rendering produces dark splotches at the centers of the pretrace blocks, as shown in the attached image. Blocks rendered earlier have darker splotches. They also differ in shape between renders even with +HR (but not with +WT1).

Turning “always_sample” on, changing “pretrace_end” to 0.01, or increasing “count” past 1000 makes them imperceptibly faint (they can still be seen by increasing image contrast).

This is possibly a bug, as 3.6 doesn’t produce these artifacts regardless of additional settings.

povray.beta-test thread

Closed by  Christoph Lipka
Thursday, 21 June 2012, 22:51 GMT
Reason for closing:  Fixed
Additional comments about closing:  

no news, so I guess the fix was effective

Christoph Lipka commented on Thursday, 19 May 2011, 14:29 GMT

Closer analysis of the artifacts indeed revealed an implementation flaw in the radiosity code, which was introduced with change #5112. Working on a fix right now.

Christoph Lipka commented on Thursday, 19 May 2011, 14:43 GMT

will be fixed with change #5438


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