Viewer node highly increases render time #45560

New Issue

BernhardS · 2015-07-25T19:01:49+02:00

BernhardS commented

2015-07-25 19:01:49 +02:00

System Information
Win7 64-bit, nvidia GTX 750ti

Blender Version
Broken: 2.75a
Worked: (optional)

Short description of error
When rendering in the compositor, the rendering-time doubles when using a viewer-node.

Exact steps for others to reproduce the error
In the image I show an exemplary compositor-node-setup. I used many mix-nodes to get a longer render-time, so you can see the effect better.
On the upper half, the viewer-node is not connected and when rendering (F12) it will finish in 1:27 seconds. On the lower image, the viewer-node is connected, which results in the render-bar passing through two times and a doubled render-time.

A notable fact is, that when using other nodes (e.g. glare-nodes), the render-time will be only a little bit longer, but they do not seem to be calculated twice.

**System Information** Win7 64-bit, nvidia GTX 750ti **Blender Version** Broken: 2.75a Worked: (optional) **Short description of error** When rendering in the compositor, the rendering-time doubles when using a viewer-node. **Exact steps for others to reproduce the error** In the image I show an exemplary compositor-node-setup. I used many mix-nodes to get a longer render-time, so you can see the effect better. On the upper half, the viewer-node is not connected and when rendering (F12) it will finish in 1:27 seconds. On the lower image, the viewer-node is connected, which results in the render-bar passing through two times and a doubled render-time. A notable fact is, that when using other nodes (e.g. glare-nodes), the render-time will be only a little bit longer, but they do not seem to be calculated twice. ![ViewerBug.jpg](https://archive.blender.org/developer/F212529/ViewerBug.jpg)

BernhardS commented

2015-07-25 19:01:49 +02:00

Changed status to: 'Open'

BernhardS commented

2015-07-25 19:01:49 +02:00

Added subscriber: @BernhardSteuer

Julian Eisel changed title from ~~Compositing-Viewer-Bug?~~ to Viewer node highly increases render time

2015-07-25 19:13:36 +02:00

Julian Eisel commented

2015-07-25 19:21:11 +02:00

Added subscriber: @JulianEisel

Sergey Sharybin was assigned by Julian Eisel

2015-07-25 19:21:11 +02:00

Julian Eisel commented

2015-07-25 19:21:11 +02:00

Can confirm that here. Assiging to Sergey to get his input.

BernhardS commented

2015-07-25 22:43:23 +02:00

I tested several other versions of blender:

In 2.61(.0 r42615) the problem does not seem to be existent, but I noticed, that if you re-render the image, without altering the node-setup, the rendering will be generally quicker. Also noteworthy is, that the rendering will only take about 1/10 the time, compared to blender 2.75 (or 2.70, 2.69 ...)

Blender 2.64(.0 r51026) shows the described problem just like blender 2.75, but the rendertimes are also much shorter for the same node-setup (01.15s in 2.64 and 09.62s in 2.75).

All following versions that I tested (2.67, 2.68a, 2.69 and 2.70) also take longer to render, when the viewer-node is connected.

What I find interesting is, that the jump in rendertime happens between 2.68a and 2.69 (1.5 seconds in 2.68a vs. 8 seconds in 2.69).

I tested several other versions of blender: In 2.61(.0 r42615) the problem does not seem to be existent, but I noticed, that if you re-render the image, without altering the node-setup, the rendering will be generally quicker. Also noteworthy is, that the rendering will only take about 1/10 the time, compared to blender 2.75 (or 2.70, 2.69 ...) Blender 2.64(.0 r51026) shows the described problem just like blender 2.75, but the rendertimes are also much shorter for the same node-setup (01.15s in 2.64 and 09.62s in 2.75). All following versions that I tested (2.67, 2.68a, 2.69 and 2.70) also take longer to render, when the viewer-node is connected. What I find interesting is, that the jump in rendertime happens between 2.68a and 2.69 (1.5 seconds in 2.68a vs. 8 seconds in 2.69).

BernhardS commented

2015-07-26 12:42:42 +02:00

This comment was removed by @BernhardSteuer

*This comment was removed by @BernhardSteuer*

Sergey Sharybin commented

2015-07-28 19:22:21 +02:00

Changed status from 'Open' to: 'Archived'

Sergey Sharybin closed this issue

2015-07-28 19:22:21 +02:00

Sergey Sharybin commented

2015-07-28 19:22:21 +02:00

2.64 was the version which included new compositor system which didn't really turn out to be perfect from avoiding full re-compo for viewer node. Improving this situation is in TODO and not really considered a bug now. So please stay tuned for further updates!

P.S. Do you mind sharing file which renders in 1.5sec in 2.68a and 8sec in 2.69?

2.64 was the version which included new compositor system which didn't really turn out to be perfect from avoiding full re-compo for viewer node. Improving this situation is in TODO and not really considered a bug now. So please stay tuned for further updates! P.S. Do you mind sharing file which renders in 1.5sec in 2.68a and 8sec in 2.69?

BernhardS commented

2015-07-31 15:44:38 +02:00

Hello,

it was a setup similar to the one on the screenshot. Everything else is on default-settings.

Here another one, with render-times for 2.68a and 2.70:

Hello, it was a setup similar to the one on the screenshot. Everything else is on default-settings. Here another one, with render-times for 2.68a and 2.70: ![Comp_xtf4.jpg](https://archive.blender.org/developer/F216380/Comp_xtf4.jpg)

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Viewer node highly increases render time #45560