HDRI too large

[windowlove]

I'm using an HDRI image in my scene.

But the HDRI is too large..

You can see in this picture, the grass is very very large...

I tried to change tilling setting in Vray material but nothing change (image below).

Please help!!!

Sorry for my bad English:(

[aristocratic3d]

There are some decent free tutorial on how to setup HDRI in vray. I think you are in a wrong way to do the job.

[aristocratic3d]

Here you go. http://www.peterguthrie.net/blog/2010/04/vraysun-and-hdri-sky-tutorial/

[Tommy L]

It is rare that you'll actually see HDRI in the final image. Its used to generate lighting and reflections. not a backplate or ground plane.

[MD]

I disagree. It can be used for both if set up correctly. HDRI backgrounds are especially handy in animations when it is necessary for the background to move with the camera.

 

If there is a better way to do that, please enlighten me.

[BrianKitts]

Your HDR has to match the scene setup, you can't place a camera 100 feet in the air if your HDR was taken on the ground.

 

It is possible to use the HDR for lighting and background plate, if they setups are the same.

[Tommy L]

I disagree. It can be used for both if set up correctly. HDRI backgrounds are especially handy in animations when it is necessary for the background to move with the camera.

 

If there is a better way to do that, please enlighten me.

 

This is dependent on the situation. There is no parallax with an HDRI so it does look kinda goofy.

Better way? Depends on the budget and timeline. You can either model everything and render a full 3d movie, or shoot a video and comp into that. HDRI is a cheat. A good cheat, but a cheat none the less. When you get an HDRI in an animated scene it gets that 'everythings too close' look. Unless you manage to find a project thats set on an infinite plane with an uninterupted horizon...not too common in reality.

 

So far as a background plate, well again its situation dependent. HDRI's tend to be a little soft and noisy. For best results in stills its best to take a photo of the plate on a DSLR and capture the HDRI from the point of view of the subject. You dont tend to get HDRIs that are bigger than around 13k. That means that your horizontal pixel dimension is 13k pixels over FOV. Generally, thats quite small. If we consider the human eye is 60 degrees, that5s considered a comfortable FOV. 360/60=5 | 13000/5=2166. So thats a 7" image @ 300dpi, considering it started life noisy and soft, thats a pretty poor backplate.

 

Edit: One other thing, try explaining to a client why their camera is only allowed to go in certain areas because otherwise the HDRI falls apart. You will get a bank stare and an instruction 'just make it work'.

Edited December 5, 2011 by Tommy L

[MD]

Thank you for the insight Tommy. I appreciate your lengthy reply. It will definitely make me do more tests and rethink my workflow. I am currently "cheating" on the animation I am working on. It works well for this project but I can envision how it would cause problems if the camera moves were different. (I still have a lot to learn)

[Tommy L]

Thank you for the insight Tommy. I appreciate your lengthy reply. It will definitely make me do more tests and rethink my workflow. I am currently "cheating" on the animation I am working on. It works well for this project but I can envision how it would cause problems if the camera moves were different. (I still have a lot to learn)

 

Oh for sure it can work. I use it all the time, but only because budget/time dictates and it really constrains what's possible in the project so far as vista and camera moves go. I also own a Spheron, so I can make custom HDRI's in minutes.

 

In the last post I was mainly writing to the original poster.

[salvador]

I'm using an HDRI image in my scene.

But the HDRI is too large..

You can see in this picture, the grass is very very large...

I tried to change tilling setting in Vray material but nothing change (image below).

Please help!!!

Sorry for my bad English:(

 

Ok, I'm not that big an expert, but right now your scene looks like a cardboard model sitting on real grass. Are you sure about the units and scale? MAybe you need a different HDRI or scale up your model, or even better, model your enoturage and use your HDRI for sky and reflections.

 

Hope it helps.

[Tommy L]

Ok, I'm not that big an expert, but right now your scene looks like a cardboard model sitting on real grass. Are you sure about the units and scale? MAybe you need a different HDRI or scale up your model, or even better, model your enoturage and use your HDRI for sky and reflections.

 

Hope it helps.

 

no, this is not a scale or a units problem. If the HDRI had been shot at an altitude close to the scene's camera then th HDRI would have a chance of working. You cannot scale an HDRI and you cannot scale a model to fit an HDRI.

But the suggestion to model the entourage is a good one, the only real option for this shot.

[windowlove]

Thanks all...