Ray tracing too slow (not joking)

Bug #186371 reported by Blempis
6
Affects Status Importance Assigned to Milestone
blender (Ubuntu)
Expired
Medium
Unassigned

Bug Description

Binary package hint: blender

Rendering on 64-bit ubuntu is much faster than on 32-bit xp (up to 40%). However, raytracing in ubuntu is really slow, so slow it can be considered as a bug, because windows can render at multiple speed compared to ubuntu when that option is enabled.

Testing:
- Render a scene without ray tracing and compare the rendering times with xp and ubuntu and notice how much faster the latter is.
- Re-render but now ray tracing enabled. Make sure that most large objects on your scene are reflective and transparent.

Both operating systems are now rendering slower than without ray tracing but ubuntu almost stucks.

Revision history for this message
Daniel Hahler (blueyed) wrote :

Is this a graphic driver issue?
This sounds like using optimized drivers (e.g. the non-free nvidia-glx(-new) drivers for Nvidia) could make a difference?

Changed in blender:
assignee: nobody → blueyed
status: New → Incomplete
Revision history for this message
Blempis (mikko-lempola) wrote :

This should be a graphic driver issue while
a) blender renderer is supposed to be purely cpu based.
b) in my xp there are not any modifications to make better use of the graphic driver.

Besides, non-free drivers are unfortunately out of the question, at least in my case.

Revision history for this message
Blempis (mikko-lempola) wrote : Correction

I meant that this should NOT be a graphic driver issue.

Revision history for this message
Blempis (mikko-lempola) wrote :

I would highly appreciate if this bug report would be considered as 'confirmed'. Sadly, it seems that this was marked as incomplete and then forgotten. The problem remains.

Revision history for this message
Daniel Hahler (blueyed) wrote :

Well, somebody else should confirm it.. I'm not using blender myself, so I cannot help here.

Can you provide a test case, so others can try to reproduce it?
Is it slower also with 32bit Ubuntu?
Which Ubuntu version and blender version are you using?
Do you compare the same blender version on Ubuntu and Windows?

Revision history for this message
Blempis (mikko-lempola) wrote : Re: [Bug 186371] Re: Ray tracing too slow (not joking)

la, 2008-03-01 kello 17:16 +0000, Daniel Hahler kirjoitti:
> Well, somebody else should confirm it.. I'm not using blender myself, so
> I cannot help here.
>
> Can you provide a test case, so others can try to reproduce it?
> Is it slower also with 32bit Ubuntu?
> Which Ubuntu version and blender version are you using?
> Do you compare the same blender version on Ubuntu and Windows?
>

To make it sure the reason for this slow rendering is not due to my
files or my computers, security etc. just download any .blend file you
can get and open it. Hope that you are now in a 3d window, that is like
the default window when opening blender. Press ctrl-0 to get the camera
view. Select some drawn objects on the screen by right clicking your
mouse. Just hope the scene has some default settings and if not, find a
buttons window. In that view press f5 and you can change the object's
material settings. Click mirror trans to adjust how much mirror effect
the object shall have via the RayMir slider. Remember to toggle the
RayMir option. As the same way you can toggle on RayTransp to make the
object glass like. There is a slider for that as well. The ball on the
utmost left gives a rough idea how the materia should look when
rendered. Press f10 to make it sure Ray (ray tracing) is turned on. Now
press the biggest button there is, the Render button. F12 is a short key
for that, as well.

When finished, you should see the rendering time in that render window.
If everything went fine, you should now have a picture with glass, or
mirror like objects. Now compare the time with windows.

Like I said before, linux is usually 20 - 40 percent faster than
windows, but this ray tracing makes linux really freezing.

I haven't make any 32-bit tests. Generally 64-bit is much faster, but
the bug itself might be 64-bit related. I used bleder 2.44 from
repository and now I'm using 2.45 (from getdeb) while it was supposed to
be a bug fix release.

Yes, I do compare exactly the the same file in ubuntu and windows.

Daniel Hahler (blueyed)
Changed in blender:
assignee: blueyed → nobody
importance: Undecided → Medium
status: Incomplete → New
Revision history for this message
Thomas Hotz (thotz-deactivatedaccount) wrote :

Is this still an issue for you? Which Ubuntu version do you use? Thank you for telling us!

Changed in blender (Ubuntu):
status: New → Incomplete
Revision history for this message
Launchpad Janitor (janitor) wrote :

[Expired for blender (Ubuntu) because there has been no activity for 60 days.]

Changed in blender (Ubuntu):
status: Incomplete → Expired
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