Excessive pre-render time with large scene

[GIOLETS]

I'm actually use Octane 1.53.1.
I've noticed that having very large scene (like a building of about 50*50 meters), much polygons (about 3 millions); every time I need to restart the render (adding a new mesh or changing hdri envinroment,..) I have to wait long time before the render starts (up to 30 seconds).
I've noticed also that scaling down the scene (like for example to a 0,01 factor) this time decrease a lot (passing from 30 sec to 5 sec)

This is a typical Octane Render Log:
--------------------------- EXPORT LOG ---------------------------
Export materials time= 1764.961 ms
Collect objects time= 3.338 ms
Meshes creation time = 5876.515 ms
Octane voxelization time = 0 ms
Sending to Octane engine time = 116.149 ms
Total export Time = 49373.573 ms

Can anyone suggest me if there are some settings in order to solve this problem?
Thanks a lot.

Luca

[aoktar]

Hello,
In Octane slowest thing is the sending geometry to gpu. To make faster the updating process, we have partial update mechanism.
I suppose that you don't know this, right? You can put a Octane objecttag to any new mesh and it will be added/updated immediately.
This is valid on animation rendering. You can use partial updates for Interactive mode or Animation rendering.
Also why do you restart to change hdri environment? No need to restart for material updates, environment and light updates.

Words about scaling down and decreasing export time is interesting. Let me check it. This is on Renderer side, i have no much idea.
Btw, what's your system HW(cpu/gpu)?

[GIOLETS]

Your suggestion about the Octane objecttag has been useful.
I have no need to restart the render each time, many thanks.

I can confirm that scaling down the scene the starting time for render decrease.

Here my hw configuration:
win 7 64 bit
Intel i7-2600 3.4GHz
32GRam
GeForce GTX 670 4Gb

Cinema R13

Thanks a lot.

Luca

[aoktar]

Main power of Octane lays on this tag. It allow to export tagged objects as indivual meshes. Other objects will be exported as a part of one single mesh in renderer. This tag allows to refresh only this part of scene in Live Viewer or Animation Rendering. Pls check animation settings of manual. Also object motion blur and texture transform nodes will work on objects which has this tag. Pls check kitchen.c4d in samples. This scene is good sample for quick rendering