Hi ura,
the HDR image is static and is taken with wide angle lenses. If the place is small, you have less possibility to match a big object.
A car in a large and open space works better, but try to use your HDR with a smaller object like a pan or a teapot, surely it works much better and you have much more freedom.
ciao beppe
HDRI control
Hello bepeg4dbepeg4d wrote:Hi ura,
the HDR image is static and is taken with wide angle lenses. If the place is small, you have less possibility to match a big object.
A car in a large and open space works better, but try to use your HDR with a smaller object like a pan or a teapot, surely it works much better and you have much more freedom.
ciao beppe
I have a specific task - the furniture on a white background for online catalog of furniture products. I want to have an easy way to lighting and reflections. And this way of HDR. But it does not work as it should. I do not understand why?
Yes this is somewhat counter-intuitive, you change the "scale" of your object by changing your camera position: the closer to the object, the larger it will appear compared to the environment map. Moving the camera up or down will also affect the apparent scale. This is obvious in the Arion video you posted (look closely when they start texturing the tyres, at 2:10), and in the video by Rikk The Gaijin.
Effectively you have to match the camera position with the position from where the environment map was recorded.
Another problem is that an environment map is a very poor approximation of the actual lighting on an object, if that object is large compared to the space it is in. That's why a simple environment map will work for something small like a pan or a glass in a room, but not for a cabinet. To improve this you have to add some approximate geometry for the surrounding room and then assign a diffuse material with the shadow catcher option enabled for this geometry. Octane will apply some correction when the environment is visible in reflections on the cupboard. But you still have the limitation that you can use only one specific camera position.
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Roeland
Effectively you have to match the camera position with the position from where the environment map was recorded.
Another problem is that an environment map is a very poor approximation of the actual lighting on an object, if that object is large compared to the space it is in. That's why a simple environment map will work for something small like a pan or a glass in a room, but not for a cabinet. To improve this you have to add some approximate geometry for the surrounding room and then assign a diffuse material with the shadow catcher option enabled for this geometry. Octane will apply some correction when the environment is visible in reflections on the cupboard. But you still have the limitation that you can use only one specific camera position.
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Roeland
it would be logical to make the scale of the management of the environment map. Now she has some sort of a setup. When you make a map coverage of HDR Light Studio, the scale of inside and within the same octane. It seems that this is a common standard. But why not make this option for manual control.
The Arion and octane car render duplicate objects it is possible to take on the medium and long-range plan. I got the same insert kitchen in HDR. Unfortunately this is not what you need.
yet this is the best result I could get. reflections of the quality level is very good. But the image is distorted. It is necessary for each view to select the new setting position and scale. And repeatedly iterative map when zoomed out, gives a lot of hot pixels.
The Arion and octane car render duplicate objects it is possible to take on the medium and long-range plan. I got the same insert kitchen in HDR. Unfortunately this is not what you need.
yet this is the best result I could get. reflections of the quality level is very good. But the image is distorted. It is necessary for each view to select the new setting position and scale. And repeatedly iterative map when zoomed out, gives a lot of hot pixels.
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Hi ura,
maybe you can setup your own environment set starting from prebuild scenes, and create your own HDR with Octane panoramic camera.
In this way you can correct the environment based on your needs. In theory, you should be able to create your own set that you can reuse in several scenes.
ciao beppe
maybe you can setup your own environment set starting from prebuild scenes, and create your own HDR with Octane panoramic camera.
In this way you can correct the environment based on your needs. In theory, you should be able to create your own set that you can reuse in several scenes.
ciao beppe
I want:bepeg4d wrote:Hi ura,
maybe you can setup your own environment set starting from prebuild scenes, and create your own HDR with Octane panoramic camera.
In this way you can correct the environment based on your needs. In theory, you should be able to create your own set that you can reuse in several scenes.
ciao beppe
- Set the map scale environment
- Turn the environment map
You are offering:
- Make a model of the scene
- Make the environment map (which will be created by the same rules as the ones I have used)
- Use the map for reflections (I create a simpler lighting card)
- Go back to the fact that I can not change the map scale or camera angle inside it. :'(
Can someone answer any of the developers? Is it difficult to make another control parameter?
There is no "scale" parameter. An environment map covers 360°, you can't change that scale in any way. Also, reflection maps only work for things that are "far away". That car in the Arion video is a good example, none of the things in the environment map are right next to that car, and the environment only looks good from specific camera angles.
There is one other way, which works a bit similar to what Jolbertoquini mentioned: Roughly model the room with geometry, eg. a cube will give an approximation for a simple room, and then assign an emitter to that geometry which uses the environment map:
In any case, some distortion is unavoidable because an environment map cannot model the parallax effects which happen if you view things from different points of view.
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Roeland
There is one other way, which works a bit similar to what Jolbertoquini mentioned: Roughly model the room with geometry, eg. a cube will give an approximation for a simple room, and then assign an emitter to that geometry which uses the environment map:
- Set the diffuse reflectance to black.
- Use a Texture emission, and assign your environment map to the Texture input.
- Enable surface brightness. Set Sampling Rate to 0, since emitter sampling is not effective in this situation.
- use Spherical projection.
- Set the coordinate space for the spherical projection to World space.
- Edit the geometry so it matches the environment map. Or change the position and rotation of the Sphere transform until the environment map more or less fits on your geometry (or whatever geometry you're using). You can slightly tweak the X, Y and Z scale on the sphere transform as well to make it fit better, but this will distort the environment.
In any case, some distortion is unavoidable because an environment map cannot model the parallax effects which happen if you view things from different points of view.
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Roeland
it can not be done?roeland wrote:There is no "scale" parameter. An environment map covers 360°, you can't change that scale in any way.
Hi ura,
another idea is to use HDR Light studio, you should be able to create your own custom reflection HDR more easily and works pretty well with OctaneRender:
https://www.lightmap.co.uk/hdrlightstudio/
ciao beppe
another idea is to use HDR Light studio, you should be able to create your own custom reflection HDR more easily and works pretty well with OctaneRender:
https://www.lightmap.co.uk/hdrlightstudio/
ciao beppe
Hi bepeg4dbepeg4d wrote:Hi ura,
another idea is to use HDR Light studio, you should be able to create your own custom reflection HDR more easily and works pretty well with OctaneRender:
https://www.lightmap.co.uk/hdrlightstudio/
ciao beppe
This way is convenient to make the irradiance map, but is not suitable for reflection. + Scale does not change again. If its load and reduce the environment map, there is the same as in octane. There are distortions of the environment map.
I do not understand why it is impossible to change the angle of the camera in HDR? He's still dependent on the angle of the camera in the scene, but why is this proportion?