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Using HDRI / Light Gen while rendering orthographic views

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  • Using HDRI / Light Gen while rendering orthographic views

    Hey guys!

    I am trying to use HDRI skies to render building elevations. When I go into that ortho view, I lose the sky effects and all of the reflections of those effects on the glass. I assume this has something to do with the light being a hemisphere in shape. does anyone know of a good work around to get what I am looking for? The images below show what I want with what I got. The image showing what I want is a perspective view, NOT an orthographic view. Anyone know of a way to get the ortho view with the effects?
    konstantin_chaos -- if you're seeing this, this is the question I asked during the webinar last week.
    Last edited by jesse_duclos1; 26-07-2021, 04:49 PM.

  • #2
    Hey jesse_duclos1

    I'll leave the reply here as well;

    In order to produce an image V-Ray shoots rays from the camera and traces them around the scene. When an orthographic camera is used, all rays travel in a unified direction parallel to one another. Once a ray gets reflected by an object’s surface and if there is nothing else in its path it has to sample the environment.

    Spherical environments (and Dome lights) are sampled as if they are infinitely far away from the set. This means that the ray direction is the only thing that matters.
    As a result it is possible that the entire building facade (especially if it’s flat) reflects a single pixel from the spherical environment map.

    As a workaround an actual piece of geometry (mapped with a texture) can be placed behind the camera to make the window reflections more interesting.
    Nikoleta Garkova | chaos.com

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    • #3
      thank you nikoleta.garkova

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