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Having trouble with the Iray Atmo Cam

kyoto kidkyoto kid Posts: 42,157
in The Commons

...been trying to render a scene with the Iray Atmo Cam however it appears the fog "effect" for some reason stops aboiut 20% from the bottom of the render window creating a very distinct line across the bottom of the scene.  Been spending more than an hour fiddling with what adjustments there are but none seem to fix this.  Looked to see if there was a tutorial or even ReadMe but couldn't find anything that helps.

Comments

  • BradCarstenBradCarsten Posts: 856
    edited July 2017

    did you go into wireframe mode and look at the Atmo Volume to make sure it isn't 1) intersecting the camera, or 2) positioned too high up?

    Post edited by BradCarsten on
  • kyoto kidkyoto kid Posts: 42,157
    edited July 2017
    bradrg said:

    did you go into wireframe mode and look at the Atmo Volume to make sure it isn't 1) intersecting the camera, or 2) positioned too high up?

    ... It appears to go below the floor plane.  I wouldn't know how to tell if it intersects the camera.

     

     

    Post edited by kyoto kid on
  • Joe WebbJoe Webb Posts: 837

    I'll either use a seperate camera or perspective view, switch to wireframe and look to see where the fog-sphere is in relation to the atmocam (and lights and such around and in it). This can be hard - if you pull back far enough to see the entire sphere it can be hard to locate the camera itself. You can select the sphere itself and move it around a bit. Or select the camera, pull it back (dragging the sphere with it) and then go into the camera control and zoom back in to set the framing you want.

    You could be picking up a shadow from a strong light source, that can appear like a cutoff (but mine generally look a little diffuse, like the edge of a godray maybe).

  • kyoto kidkyoto kid Posts: 42,157

    ..well I am using the Iray Sun (Sky/Sun mode) with the sun dial instead of fiddling with all the time, day, and latitude settings.

    I did find the sphere settings and would rather use that than move the camera as I have the latter positioned to the the original render camera

    So is there some way to fine tune the fog density like one could do with the AoA Fog Camera?   I tried adjusting the cutout opacity but even 1% negates the fog effect entirely.

  • HorusRaHorusRa Posts: 1,665
    edited August 2017

    I see this sometimes and in the cases where I've seen it it has been because the fog sphere's boundary is in view of the camera right where the sphere intersects the floor of your prop, if that makes any sense.
    ​I've corrected the problem by changing the viewports draw style over to 'Hidden line' and moving the sphere closer to the camera making sure the intersection of the sphere and floor is NOT in view in the camera.
    In one case I was not able to get rid of it because of how low to the ground I needed the camera and I had to remove it in photoshop, partially covering the line with fog, clone tool and etc.

    Post edited by HorusRa on
  • AlmightyQUESTAlmightyQUEST Posts: 2,006

    For fine tuning the fog density, there are presets with the product, but also you would be adjusting the SSS amount value rather than cutout opacity. These are very low values for all of the presets, so not sure how difficult it is to do very subtle fine tuning. I don't know enough about the materials to know if there are other settings that could help adjust that effect.

  • BradCarstenBradCarsten Posts: 856
    kyoto kid said:

     

    ... It appears to go below the floor plane.  I wouldn't know how to tell if it intersects the camera.

    is that where it's drawing the line- where the volume disappears into the floor, or is it somewhere else? 

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