Big FPS drop with Sprite3D as ground and 14 omnilights

[ScyDev]

In my example, the grass which is the background for everything else.
I've tried one big Sprite3D (13x26m), but noticed that this eats about 30 FPS in fullscreen, as compared to no visible ground at all.
Then I've tried many smaller sprites (2.6x2.6m) to cover the same area, which eats "only" about 15 FPS, but still way too much...
What is strange is that only the ground makes this huge difference in FPS. All the other sprites in the game seem to hardly make a difference in FPS if I enable or disable them.
All of them, including the ground, are shaded and receive shadows.

[ScyDev]

The ground has always had alpha disabled, so that can't be the issue.

One diffecrence is that the ground sprite is oriented on Y axis, while all the other game objects are oriented on Z axis.

[ScyDev]

Oh wow! You won't believe this! :D

If I change the ground sprite to Z axis, the FPS drop is gone. Even with one big Sprite3D for the whole level.
So this seems to be what actually causes the performance loss. But of course this looks wrong. I still need the ground to be oriented on Y axis.

Can you fix this? Should be something obvious, right?
Or am I trying to do something here that Sprite3D wasn't meant to do?

[ScyDev]

Do you still need a scene or can you reproduce it yourself with this new info?
If you need it I will do it, but I like to prevent unnecessary work.

[reduz]

No, I truly have no idea what's going on, would really appreciate a test
scene :)

On Mon, Jun 15, 2015 at 12:10 PM, ScyDev notifications@github.com wrote:

Do you still need a scene or can you reproduce it yourself with this new
info?
If you need it I will do it, but I like to prevent unnecessary work.

—
Reply to this email directly or view it on GitHub
#2096 (comment).

[ScyDev]

Ok, working on it.

[ScyDev]

Save this JPG and rename it to ZIP ;)

[ScyDev]

This runs at 44 FPS for me.

Hide the Ground sprite (or orient to Z axis) and you get 60 FPS.
Or hide the light sources and you get 60 FPS.

So it seems to me that if the Ground is oriented on Z axis, it receives light from only a few of the sources and that's why that affects performance. So axis orientation is not actually the cause of this problem.

But light seems to be very expensive. Roughly 1 FPS lost for every light source. Especially if they all shine on the same sprite, that's why it helped when I made the ground from many small sprites instead of one big one.

And having 2 moving light sources seems to eat about 15 FPS all by itself (not in this scene, but in my game I've noticed this).

[ScyDev]

Is this the expected performance with lights?
Or am I doing something wrong?

[bojidar-bg]

@ScyDev BTW, what happens when you disable shadows?

[ScyDev]

None of the lights in this demo are casting shadows.

[ScyDev]

I just found out, I have such extremely low FPS because I lost OpenGL support when I last updated my Ubuntu.
On my gaming PC I get about 2500 FPS in the best case.

However, the huge impact of lights is still there. In certain situations it drops from 2000 to 400 FPS.

[kubecz3k]

Trying to triage this issue:
In the light of previous comments I'm assuming that while the issue is generally solved the 3d rendering engine still could be faster. 3d rendering will be completely rewritten in Godot 3.0 and the huge performance boost is expected in this release. Due to this I don't see the need for this issue to be opened in it's current form, so I'm archiving it.