[Bf-committers] BGE Projection Matrix in Blender 2.5x

[Dalai Felinto]

Hi,
once again even if it's a suspicious of a bug the tracker is the
better place for this. It's easy to track, assign people to look at
... or even the blenderartists forum

That said it's not a bug. In Blender 2.5x the matrix order is reversed
compared to 2.49. I think this is mentioned in one of the release
logs.
See your file "fixed":
http://dl.dropbox.com/u/3292898/projection_260.blend

Regards,
Dalai

2011/11/1 Julian Adenauer <julian.adenauer at zmms.tu-berlin.de>:
> Hi Dalai & others,
> thank you, that is right.
>
> Unfortunately there is still a problem. When I assign the following
> matrix to a camera I get something very different in Blender 2.49
> (compression in z-direction) and 2.5x & 2.6 (grey screen):
> [[1.0, 0.0, 0.0, 0.0], [0.0, 1.0, 0.0, 0.0], [0.0, 0.0, -1.0,
> -0.20020020318640186], [0.0, 0.0, -1.0, 0.0]]
>
> Does anyone have an idea why this behaviour differs that much and what I
> can do about it?
>
> Here are the my test files:
> 2.49: http://dl.dropbox.com/u/487436/projection_249.blend
> 2.60: http://dl.dropbox.com/u/487436/projection_260.blend
>
> Of course this is not the place for bugs, but I am still trying to
> figure out if this really is a bug or just me...
>
> Thanks!
>
> Julian
>
>
> On Tuesday, November 01, 2011 5:27 PM, "Dalai Felinto"
> <dfelinto at gmail.com> wrote:
>> Hi Julian,
>>
>> the problem/bug is that the camera matrix is an identity matrix at
>> frame one ([1,0,0,0],[0,1,0,0],[0,0,1,0],[0,0,0,1]])
>>
>> If you use a Delay Sensor for your script you will not have the
>> problem. That should solve your problem for the time being.
>>
>> Do you mind sending this report with an attached file for the bug
>> tracker? The list is not the best place for bug reports.
>>
>> Thanks,
>> Dalai
>>
>> 2011/11/1 Julian Adenauer <julian.adenauer at zmms.tu-berlin.de>:
>> > Hi,
>> >
>> > I stumeled upon a strange behaviour in the GameEngine (2.5 and above)
>> > when the projection matrix is set.
>> > The following script (put into the standard file, activated by an always
>> > sensor attached to the box) works in 2.49, but only shows a grey screen
>> > in 2.5 and above:
>> >
>> > import bge
>> > scene = bge.logic.getCurrentScene()
>> > scene.active_camera = "Camera"
>> > m = scene.active_camera.projection_matrix
>> > scene.active_camera.projection_matrix = m
>> >
>> > This is also true for all other matrices I tried.
>> > Is that a bug or am I missing something here?
>> >
>> > Best,
>> > Julian
>> >
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