Render this: Stained glass

solo · 21 May 2011, 15:45

I thought I'd give it a play with this morning. I used a standard photo for a window, used the image as a transmittive layer on thick glass material.

Frederik · 21 May 2011, 19:22

Looks great, Solo... Crisp and very clean...
What render app did you use and how long time did it take to render...?

solo · 22 May 2011, 01:25

Thanks.

Thea render as usual (love that app), I ran it with TR1 for around 2 hours.

zdesayn · 25 May 2011, 13:34

very nice disperse...good job.

andybot · 2 Aug 2011, 00:54

Thanks to Solo for pointing out this thread from the vray forum. Pretty cool stuff! The vray output left me a little unsatisfied, so I played around with the material and found that it needs the map to be put into a refraction slot. Here is the result. I could play around bumps and caustic, but thought this is a good start.

Andy

Roger · 8 Aug 2011, 17:26

A note about capturing stained glass window images:
The brightness range of a stained glass window is often beyond the capability of film or digital media to capture. Typically some panels will be burned out to white and others will be pitch black. For the window above, I bracketed my exposures and selected the best mid tone exposures, the best highlights and the best shadows. And, I needed another even deeper exposure for the children. Then I cut out all the glass that did not look good and replaced it with the proper replacement.

I remember the Torah was black and the kids were nothing more than silhouettes. The dove and some of the village building s were burned out highlights.

To replicate what the highly sensitive eye sees you need make some technical adjustments.

Roger · 8 Aug 2011, 17:45

@arail1 said:

This should be in the 'Renders I've Failed At' or whatever that thread was called but I can't seem to find it.
I'd like some advice on how to get some highlights into the glass itself. I like the brick wall. I like the floor. I like the reflections. But the glass itself is quite dead.

Rendered in modo.

Also, I'm wondering if Solo would have any interest in offering a 'Master Tutorial' about his last post in this thread? I keep looking at that image and I can't imagine how it was achieved.

Any help is appreciated.

Were you hoping for something closer to this?

Nina100 · 22 Jul 2013, 19:35

Hi guys!
These renders all look amazing im really impressed!

Im currently trying to render some stained glass windows in a church model.
I have read all these posts put they are a bit over my head and was hoping someone could give me more instructions.

Im using google sketch up 8 with vray and want to create the best effect I can get using an imported stained glass image.
I believe this is what 'Andybot' did and it looks great.

Many Thanks
Nina

Al Hart · 23 Jul 2013, 00:39

There are a few basic approaches being used.

The simplest thing to do is to make the glass in the window the color of the desired color, and then shine the sun through it.

Most people, such as this example using Maxwell, added "Caustics" to the reflective properties of the glass. Caustics causes light passing through the glass to distort. (I you are reading while drinking some wine, this look at the shadow f you wine glass on the table. The caustics cause the interesting shadows.

For the IRender nXt exmample, I also added smoke/haze to the room, so you see the beams of light passing through it.

Nina100 · 23 Jul 2013, 03:36

Hi Al,

Thank you for replying to my post.

First rookie error....I forgot to switch on the sun lol!

I really like the caustics effect you have given an example of as my reflections of light are very stiff. But I cant seem to find that option in my vray materials editor. Do you know if this is avaliable in vray?

I love the smoke/haze effect aswell, how did you create that?

After reading posts on here and info from a few other sites I created my stain glass windows the following way. Its prob not the best way but it works and thought it would be useful to share for other beginners

Adding the "stain glass" image to the window as a material.
In vray material editor adding a "refraction" layer
In the refraction layer changing the brdf diffuse transparency to white
In brdf refraction adding a map of my "stain glass" image

If someone can let me know how to upload images onto here I will post the results

Mike Amos · 23 Jul 2013, 08:34

Renditioner.

andybot · 28 Jul 2013, 04:45

@nina100 said:

Hi guys!
These renders all look amazing im really impressed!

Im currently trying to render some stained glass windows in a church model.
I have read all these posts put they are a bit over my head and was hoping someone could give me more instructions.

Im using google sketch up 8 with vray and want to create the best effect I can get using an imported stained glass image.
I believe this is what 'Andybot' did and it looks great.

Many Thanks
Nina

Hi Nina,

The basic thing I did to change the material so vray understood it correctly was to add a "refraction" layer. If you right click on the material in the vray material editor - you see the option to "create layer". Then in this new refraction layer, for the "color", add a texture (click on the "M" button, then change to TexBitmap, then browse for the image file of the stained glass - you may need to save it first from SU) and then make sure "affect shadows" and "affect alpha" are both checked.

Best,

Andy

andybot · 28 Jul 2013, 05:28

Thought I might as well try the stained glass caustics with the new vfs beta. Here are some new renderings of this scene. One has the "affect alpha" and "affect shadows" enabled, and the other is just caustics lighting the interior.

Brighter3D · 1 Jun 2014, 17:38

I like this rendering threads more and more,
just fixed propagation through textured glass...

brighter3d 1.16 (free) 39 seconds (7 threads).