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Ceciliabr
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Light & textures - rendering examples of this and that.

Are high-res textures and big 3D models really what’s slowing down the rendering process?
Ever since I started working with SH3D, I have had the understanding that using tiny 3D models and
tiny textures will render a lot faster than using big 3D models and high-res textures.
But after experimenting for some time now with 3D models and textures, I’m seriously questioning this.
In my experience, this is what is slowing down the rendering process ( in this order):

1) Using the path-setting for global illumination.

2) Using a very high number of light sources.

3) Using the external brightness setting (IBL) (to some extent).

Using big sized textures makes Sunflow think for a while before starting the rendering process,
but once it starts, it renders just as fast as with small textures.




Here are two renderings where I'm using big sky textures ( 15000x3500 px), IBL and sunlight + a few light sources.




The reason for the significantly longer rendering time here is the very complex high-poly tree (76Mb textured),
which is unnecessary for a wide shot like this.
On the first image I use a low-poly version of the tree (3.2Mb) and it works perfectly well.

Another Sunset (All these sunsets are inspired by my short summer vacation in Norway):

Rendered with moon setting and just one big light panel simulating sunlight.
The sky texture is a high-res 15000x3500 px of 11Mb, downscaled from a 55Mb bmp image created with Vue eXtream.

The curious contraption on the left is my attempt to construct a rack for drying fish.
(If you're a local, you are welcome to laugh your head off.)

Here is a way more complex project, with a really BIG terrain texture, and a 15000x3500 px sky texture.
This time rendered without IBL (External brightness off):




Here's something to think of if the preview window is getting slow and difficult to handle:



And to finish this intro...






More to follow.

Cec
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[Edit 1 times, last edit by Ceciliabr at Aug 28, 2018 1:45:04 AM]
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enkonyito
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Re: Light & textures - rendering examples of this and that.

In my experience, this is what is slowing down the rendering process ( in this order):

1) Using the path-setting for global illumination.

2) Using a very high number of light sources.

3) Using the external brightness setting (IBL) (to some extent).

1) Using the path-setting for global illumination. TRUE
The larger the value of diffusedBounced, the more time it will take to render.

2) Using a very high number of light sources. TRUE

3) Using the external brightness setting (IBL) (to some extent). TRUE
Sample values have been increased for good interior rendering and better definition of the outer shadows.

And I'll add in 4) Using detailed or complex objects like trees.
In this case, the rendering "stagnates" on a part then accelerates.
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EnkoNyito gallery
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UbuntuBirdy
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Re: Light & textures - rendering examples of this and that.

some more slow-down reasons:
- transparent materials
- reflecting surfaces
----------------------------------------
SH3D 6.0 / Ubuntu 18.04 (Mainline-Kernel) / Radeon RX580 / Ryzen 7 1800x
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Ceciliabr
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Re: Light & textures - rendering examples of this and that.

3) Using the external brightness setting (IBL) (to some extent). TRUE Sample values have been increased for good interior rendering and better definition of the outer shadows.
It's a very nice feature that I use a lot.
Adding different colours or images (or even solid black) to the top part of the sky, can really make some incredible lighting effects.

And I'll add in 4) Using detailed or complex objects like trees. In this case, the rendering "stagnates" on a part then accelerates.
Absolutely!
But it's important to differentiate between large and complex models.

C
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VeroniQ
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Re: Light & textures - rendering examples of this and that.

Cecilia, I love this two nasty marsians!
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Xiste
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Re: Light & textures - rendering examples of this and that.

If you're a local, you are welcome to laugh your head off.
Nope, being somewhat local I'm not laughing my head off!
Your attempt to create a "hjell" has resulted in a quite adequate rendition.
And let me add: These are wonderful renderings, Cecilia, you have totally captured the soul of northern Norway here!

In Italy dried cod from Lofoten, Norway is called stoccafisso and regarded a delicacy.
In Norway we feed it to the dogs.

Like VeroniQ I love your angry martians.

More to follow
I look forward to that.

Xiste
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Ceciliabr
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Re: Light & textures - rendering examples of this and that.

Cecilia, I love this two nasty marsians!
smile me too, and my daughter absolutely fell in love with them and named them Popp and Ding. She wants to have them 3D-printed.

I have been experimenting a bit in my spare moments and tried out different ways to create models, apply textures and use the new light panels from Enko. That's how the two ugly martians came about, without any relationship at all to anything else I normally do.
I plan on publishing some more of these absurd experiments later.


Cec
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Ceciliabr
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Re: Light & textures - rendering examples of this and that.

In Italy dried cod from Lofoten, Norway is called stoccafisso and regarded a delicacy. In Norway we feed it to the dogs.
I know. We used to give it to the cat when we lived in Oslo.
... you have totally captured the soul of northern Norway here!

Thank you!
We only did a short visit, but I will definitely go back for a longer period next time.


Cec
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Ceciliabr
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Re: Light & textures - rendering examples of this and that.

PART TWO

The final output of any 3D project will often be an illustration of some sort, like f.i. this snapshot of SweetHome3DExample4 ,
here placed in a rural environment,




or like this interior from 2014 (one of my first projects),




or a snapshot of a toxic camping ground,




or something completely different.




So...

ABOUT THE SKY

Yes – I am aware of the fact that for most users the technical quality of a snapshot from SH3D is of less
importance – but since the program offers to create photographic snapshots (and since there has – in the past –
been held competitions here to score the best SH3D-rendering), I assume that for some users both the artistic and
the technical quality of the end product has a certain value. Being one of these users myself, I prefer to have
something other than a tiled lawn, a pixelated sky and a sharply drawn horizon surrounding my creations.
Avoiding that, has been a priority since I first started using SH3D.


EXAMPLE


A morning shot of a small farm surrounded by a lively horizon:




or in a totally different mood – created by a sky with a moon and a couple of stars:



This is easy to do for anyone with basic knowledge of any photo-editing software.
I use Photoshop, but Gimp is a totally free open source equivalent that's easy to use.


The sky is basically a 360° backdrop.


When I want to create a certain environment and atmosphere for my projects, I can either use one or several separate
standing backdrops, or I can use the sky.
The advantage of using the sky is that I don't have to move my backdrops around and adjust the lighting every time I
want to shoot from a different angle or change the perspective.
The disadvantage is that it can be a bit tricky to determine where to put things on the sky: The equirectangular projection
has played tricks on me for several years, and it's only recently that have I been able to uncover the basic principles –
and how to handle it.
To help me find my way around it, I have constructed a handy template that enables me to pinpoint quite precisely where
to place a moon, a sunset or some decorative clouds on the sky image, in order to make them appear exactly where I want them
to be on the final renderings.
The template looks like this:



and renders like this:



________________

So, if anyone think they can find it useful: Right-click on the links to download.

Sky Template 6000x1500px (390kb)

Sky Template 15000x13750px (1.1Mb )

The smallest image is often enough, but for close-ups (from FoV 40 and closer) I always use the bigger image.

________________

Sky template project file if anyone wants to experiment with it: SKY-template.sh3d

_________________

Here are some sky and horizon snaps to show the curvature and the sector at three different FoVs:

SkyImage-spherical:



SkyImage @ FoV 120:



SkyImage @ FoV 60:



_________________


More later...


Cec
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[Edit 1 times, last edit by Ceciliabr at Aug 29, 2018 8:22:23 PM]
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UbuntuBirdy
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Re: Light & textures - rendering examples of this and that.

I'm just impressed... just impressed, but extremely impressed !!!
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