Terragen 3 pre-release FAQ

Started by Oshyan, June 13, 2013, 01:46:02 am

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July 29, 2013, 12:30:15 am #150 Last Edit: July 29, 2013, 12:36:00 am by Matt
Quote from: mash on July 29, 2013, 12:02:12 am
Whats the procedure for a Linear workflow in TG3?
Do you have to apply a gamma correction on the shaders? I assume you would need to on any SRGB texture files.

In all versions of Terragen 2 or 3, the Image Map Shader has a built-in "convert to linear" setting which defaults to gamma 2.2 (which is an approximation to sRGB). This assumes you are loading an sRGB texture and want a linear workflow. If your texture is linear (e.g. an EXR) then you should set "data is linear" or set the conversion gamma to 1.0.

In the professional version will the render view window display linear files?
Or will you need to save the Liner file out and view it in an external viewer that will convert it to SRGB?

In all versions of Terragen 2 or 3 the Render View uses whatever gamma is set in the "Effects" tab of the render node. It defaults to 2.2. The whole setup is designed for a linear workflow and display on a gamma 2.2 display by default. However, this display gamma is baked(*) into the 8-bit or 16-bit low-dynamic-range image which the Render View displays, so if you want to change the gamma you'd need to re-render, but if you want a linear workflow you shouldn't need to change the gamma. EXR output is *always* linear, and ignores the gamma on the render settings.

(*) We might be able to make this dynamic in future.

You might see differences between the Render View and an external EXR viewer because Terragen has some built-in tone mapping controls (on the "Effects" tab) which affect the low dynamic range image, but not the EXR. If you turn off "contrast" and "soft clip effect" it should be perfectly linear.

I hope that makes sense. Let me know if you'd like anything explained differently.

Just because milk is white doesn't mean that clouds are made of milk.


Quote from: TheBadger on July 28, 2013, 11:38:37 pm
Hi Oshyan, or whoever answers this.

So have we been told everything now, about whats new? Or are there some things you still have not reveled?

I saw rain in someones post in image sharing. Whats that about? I got the feeling it was TG generated and not post or import of some kind. But the image post did not say much.

By the way, I saw the video for the population editor. That is a nice addition! I was very happy with what I saw.  8) I know I said so earlier from the announcement. But the video really shows it off nice. I expect I'll use that tool in just about every project.

That may have been my image called "Farm" in the image sharing forum.  It was a TG2 render and the ripples in the pond were objects with a water shader.  The rain drops were post processed using Perfect Photo Suite.
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July 30, 2013, 06:54:00 pm #153 Last Edit: July 30, 2013, 06:57:23 pm by Bjur
Hi all.

A shy question:

A TG 2.5 scene was loaded into TG 3 Free.

Why or for what are some shaders/nodes are "whitened" (or have white outlines) now in the Node Network window?

I'm sry if this got already answered somewhen/somewhere before and i was missing it..


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