Assertion failure in debug mode (star rendering)

Expected Behaviour

(normal operation)

Actual Behaviour

On zooming in, apparently an assumption about RCMAG_TABLE_SIZE does not hold. This triggers a crash in debug mode, and likely some hidden issue in release mode.

Steps to reproduce

Run a debug build, zoom in to less than 1/2°.

System

Stellarium version: master (f28b44d, 25.1+, 27.3.2025)
Operating system: Win11
Graphics Card: irrelevant

Logfile

If possible, attach the logfile log.txt from your user data directory. Look into the Guide for its location.

"[ 93.761 fatal] stellarium default unknown - ASSERT: "cutoffMagStep<RCMAG_TABLE_SIZE" in file D:\StelDEV\stellarium\src\core\modules\ZoneArray.cpp, line 445"
"[ 93.808 fatal] stellarium default StelPainter::StelPainter - There can be only 1 instance of StelPainter at a given time"

@gzotti

@gzotti how many catalogs are loaded?

Oops... I can confirm the crash in debug mode

The ASSERT: "cutoffMagStep<RCMAG_TABLE_SIZE" is written before Gaia DR3 catalog upgrade and I think the assert is not needed anymore, RCMAG_TABLE_SIZE is the size for table rcmag_table via rcmag_table[magIndex] and it is impossible for magIndex to be greater than 512. For stars in the 0th level catalog (which is for stars -2.<vmag<6.) to have magIndex greater than 512, the vmag of 0th catalog star need to be >16.6, while >24.6 for stars in the 1th level catalog.

And adding

if (magIndex > RCMAG_TABLE_SIZE)
{
	qDebug() << "ERROR: SpecialZoneArray::draw: invalid magnitude index:" << magIndex;
}

right before

const RCMag* tmpRcmag = &rcmag_table[magIndex];

to sanity check never get printed.

I was afraid the rcmag table could be too small for stars after applying extinction (we had that around 2012...), but probably it's really just a 1-off.

Fix one-off assertion bug (Fix Stellarium#4249)

@gzotti

Hello @gzotti!

Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot

@gzotti

Hello @gzotti!

Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest

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Assertion failure in debug mode (star rendering) #4249

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Assertion failure in debug mode (star rendering) #4249

Description

Expected Behaviour

Actual Behaviour

Steps to reproduce

System

Logfile

Activity

alex-w commented on Mar 27, 2025

alex-w commented on Mar 27, 2025

henrysky commented on Mar 27, 2025

gzotti commented on Mar 28, 2025

github-actions commented on Mar 30, 2025

github-actions commented on Jun 22, 2025

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