Distorted EXR
Distorted EXR
Hello,
I have just created a LatLong HDR image. I made this quick render and noticed that the backgroung image is scaled in the vertical direction :
This EXR is 6694x1595px, 72dpi. It is not a real 360° panorama, but I guess that has nothing to do with the current issue.
Skindigo 1.1.5 + Indigo 1.1.5
Within Skindigo render settings :
- Output 800x800
- Camera : default settings except f/2.8
- Environment : x Env. map - Type Lat/Loong - Gain 1000
Should the EXR image have a specific length/height ratio ?
Thanks for your help
PS : if anyone is interested in the exr file, I will share it with pleasure (not the greatest HDR though !)
I have just created a LatLong HDR image. I made this quick render and noticed that the backgroung image is scaled in the vertical direction :
This EXR is 6694x1595px, 72dpi. It is not a real 360° panorama, but I guess that has nothing to do with the current issue.
Skindigo 1.1.5 + Indigo 1.1.5
Within Skindigo render settings :
- Output 800x800
- Camera : default settings except f/2.8
- Environment : x Env. map - Type Lat/Loong - Gain 1000
Should the EXR image have a specific length/height ratio ?
Thanks for your help
PS : if anyone is interested in the exr file, I will share it with pleasure (not the greatest HDR though !)
Re: Distorted EXR
I think that is the issue here....but I'm not 100% sure.eulgrand wrote: Should the EXR image have a specific length/height ratio ?
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The fact that you've got a 4:1 aspect ratio is the problem. Even if you rescaled this to 2:1, you distorted the image in the process.
Add black bars at the top and bottom to bring the proportions to 2:1. Alternatively, crop the image to a 2:1 aspect ratio.
When mapping an image to a sphere using spherical mapping, you cover 360 degrees in the x direction and 180 degrees in the y direction -- hence the 2:1 aspect ratio requirement.
Add black bars at the top and bottom to bring the proportions to 2:1. Alternatively, crop the image to a 2:1 aspect ratio.
When mapping an image to a sphere using spherical mapping, you cover 360 degrees in the x direction and 180 degrees in the y direction -- hence the 2:1 aspect ratio requirement.
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True. Neither the cropping nor the black bar method is entirely satisfactory. The former will leave seams which may appear in reflections. The latter will, of course, leave the black bars, which won't cast light properly and will also appear in reflections.OnoSendai wrote:If it's not a 360 degree panorama, then I don't think it will work correctly.
Re: Distorted EXR
Hi!
Thanks for these useful pieces of information.
I'm a total beginner in terms of environment maps.
I've got the following problem:
I'm trying to use a "clear sky" environment map (.exr file) but it's way too bright if I use the default settings.
I'm using Skindigo.
I modelled a room with 3 wide windows, so that light can come into the room profusely and light up the room.
(sorry I'm at work, I have no picture to attach)
I've tried several things, like:
- lowering the env map Gain down to 1 (!)
- lowering camera ISO down to 1 (!!!)
- lowering the camera "ev adjust" down to -10 or -15 (!!!!!!!)
But it still is very bright compared with the room.
When the settings are very low (like above) I get a very dark room, and a very "dull" env map in the background.
Any idea about the settings I should use?
Many thanks for your replies, I'm really stuck at the moment...
Thanks for these useful pieces of information.
I'm a total beginner in terms of environment maps.
I've got the following problem:
I'm trying to use a "clear sky" environment map (.exr file) but it's way too bright if I use the default settings.
I'm using Skindigo.
I modelled a room with 3 wide windows, so that light can come into the room profusely and light up the room.
(sorry I'm at work, I have no picture to attach)
I've tried several things, like:
- lowering the env map Gain down to 1 (!)
- lowering camera ISO down to 1 (!!!)
- lowering the camera "ev adjust" down to -10 or -15 (!!!!!!!)
But it still is very bright compared with the room.
When the settings are very low (like above) I get a very dark room, and a very "dull" env map in the background.
Any idea about the settings I should use?
Many thanks for your replies, I'm really stuck at the moment...
Visit my website!
http://www.fairview-3d.com Studio 3D
http://www.fairview-3d.com Studio 3D
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- Posts: 1828
- Joined: Mon Sep 04, 2006 3:33 pm
Re: Distorted EXR
Yeah, if your EXR only covers the sky, then enlarge your canvas in Photoshop x2 while keeping the sky on top. You should just have a big black bar that covers the bottom half of your image, where the ground and everything below the horizon should be.
About the lighting, it makes sense that the sky outside will be overexposed if you're going to have a bright interior. Keep in mind that the light has to come in only through a couple windows, so it has to be much brighter than it would be outside. Taking a picture of the inside of your house with a camera will illustrate this: your exterior will be blown out, or your interior will be underexposed.
About the lighting, it makes sense that the sky outside will be overexposed if you're going to have a bright interior. Keep in mind that the light has to come in only through a couple windows, so it has to be much brighter than it would be outside. Taking a picture of the inside of your house with a camera will illustrate this: your exterior will be blown out, or your interior will be underexposed.
Re: Distorted EXR
Thanks StompinTom for these useful pieces of information, and for the PhotoShop tip : it should work now, many many thanks!!!
Visit my website!
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