[SOLVED] 2.19: "invalid projection matrix" when SpiderVision file is created with IG+VR template

[Amerio.Stephane]

Hello, this one took me a while to isolate...

• Create a new 2.19 IG+VR cpp template (the VR part seems important...), with SpiderVision and Syncker
• Add IG, SpiderVision, Syncker on the start up command line
• Start the app, press F10 and create a default.sv file in /data
• set console_onscreen 1
• Restart the app
• The console will dump a constant stream of 
  ERROR:    Camera::setProjection: invalid projection matrix.

Apparently, the default.sv <viewport> section contains this attribute
head_pos_offset="0 2.08999991 0" 
which create this stream of error. Removing it fix the problem, until a new sv needs to be created...

Sub-question: What is this for?

 

[silent]

Hi Stephane,

Looks like a bug to me. We will try to fix it prior 2.19.1 update. Probably there is a bug in internal code that tries to set head position in VR to the specified in config, but for some reason fails to do that.

Thanks for pointing that out!

[silent]

The root cause of the issue is that the screen position and camera position share identical coordinates in the SV configuration. In this situation, accurately calculating the projection becomes impossible. We have adjusted the default positions in version 2.19.1, and there should be no errors in new projects.