[14.3] renderQueue 50 is rendered after renderQueue 51

[suny2000]

Ogre Version: 14.3

I'm using renderQueues to control the rendering order of the sprites in my SHMUP Creator engine: sprites are just transparent planes. Users can create 'layers' to control the rendering order of those objects, as most of those sprites are rendered at the same depth.
I'm using setRenderQueueGroupAndPriority(40+ layerNumber) to render the planes.

The last engine update was using Ogre 13.6, but since I updated it to 14.3, some users noticed regressions in the rendering order.
It worked well, until recently, and I found that the rendering order is wrong only when a plane uses setRenderQueueGroupAndPriority(50).

So, for example:
.plane1 setRenderQueueGroupAndPriority(40) and plane2 setRenderQueueGroupAndPriority(41): plane1 is rendered behind plane2.
.plane1 setRenderQueueGroupAndPriority(50) and plane2 setRenderQueueGroupAndPriority(51): plane1 is rendered above plane2.

As 50 is RENDER_QUEUE_MAIN, my question is: is there something different with this queue number?
S.

[paroj]

did you look at it in renderdoc?

[suny]

I did a capture, and:
RenderQueueGroup 49 is drawn first, then RenderQueueGroup 50
but
RenderQueueGroup 51 is drawn first, then RenderQueueGroup 50

[rpgplayerrobin]

I tried this myself, and I get the exact same results as you do.

The problem is that if you set "tmpEntity->setRenderQueueGroupAndPriority(50, 0);", it actually gets put in group 95, if the object is transparent.

That is because of this code in "RenderQueue::addRenderable":

Code: Select all

if(groupID == mDefaultQueueGroup && onTransparentQueue(pTech))
     groupID = RENDER_QUEUE_TRANSPARENTS; // This is 95

My guess is that this code exists to make transparent objects to be rendered last as default, but that if you want to have more control you could set it to another group, but this of course fails with that code on group 50 (default group).

To fix the problem, you could:

1. Just remove that code from the Ogre source and make sure your normal transparent objects are in group 95 per default if you have not set a group on them.
2. Make it so that users can only put their transparent objects in queue 51-95.
3. You could alter the Ogre source code to only make that check if the priority group has not been set (mRenderQueueIDSet in MovableObject).