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Thread: Renderings out of Revit linked to 3dsMaxDesign always missing some 'Level' in PS

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    Senior Member willsud's Avatar
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    Renderings out of Revit linked to 3dsMaxDesign always missing some 'Level' in PS

    Just wondered if anyone knew why, for as long as I can remember (so, not that long ) still rendered images created by iRay in 3dsMD from a Revit model linked in to 3dsMaxDesign (v2015, 2014 at least) has the bottom area of the 'Levels' adjustment dialog in Photoshop missing (see attached).

    I can drag the bottom right slider along until it meets the start of the graph slope which sort of seems to improve the image, but even using an HDRI image for lighting the render I don't get any presence in that area of the graph.

    Not a huge problem but it has long puzzled me and I wondered if anyone could suggest a technical reason of what I might be doing wrong?

    Thanks.
    Attached Thumbnails Attached Thumbnails Renderings out of Revit linked to 3dsMaxDesign always missing some 'Level' in PS-missinglevels.jpg  

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    Member d.stairmand's Avatar
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    wouldn't have a clue, but really nice Render
    Building looks good & Materials look great

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    Senior Member willsud's Avatar
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    Thanks, kind of you to say

    Every building I do uses the same slatestone, roughcast, green roofing slate in diminished courses and random widths, which I created 15 years ago from photographs of a small building 50 yards from my office.

    This is a simple domestic garage converted to a dwelling.

    I find that using the standard sky in Revit or 3dsMaxDesign (using Mental Ray) gives quite hard shadows whereas we live in a rain-soaked area where bright sunshine is unusual. Adding a 'skylight' to the linked project in 3dsMaxDesign and switching off the Mental Ray sky and Exposure control, and assigning an HDR image ('high dynamic range' image I think it means) to the skylight seems to give a softer, flatter light which in our climate looks more realistic (even though you might have to rotate the HDR image to accord with where the sun should be in the scene).

    However, the resulting images (from the iRay renderer option in 3dsMaxDesign which works with Nvidia graphics cards - a K4000 in my case) seem to lack this 'bottom end' when viewed in Photoshop's Image Adjustment->Levels which seems odd.

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    Forum Addict GMcDowellJr's Avatar
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    I think you just explained what's going on... all those settings you changed to make the image softer and flatter is killing your dynamic range. There just isn't enough illumination to get what whites (what I would call the upper range of the histogram) you have in the model a chance to pop.
    jpeter78 likes this.

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    Senior Member willsud's Avatar
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    Sounds logical to me - thanks very much

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    Senior Member willsud's Avatar
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    Tada! Result

    Thanks to GMcDowellJr pointing me at the right area I noticed 'Use Scene Environment' wasn't checked in the skylight parameters in 3dsMD2015.

    Now we have some graph in the previously missing area.


    cheers
    Attached Thumbnails Attached Thumbnails Renderings out of Revit linked to 3dsMaxDesign always missing some 'Level' in PS-frontview18thjuly2014.jpg  
    jpeter78 likes this.

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    Forum Addict GMcDowellJr's Avatar
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    Looks better already!
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    Senior Member willsud's Avatar
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    Thanks - but I now think that was just luck - there is something in that rendering which isn't in others, but something in the light source settings must be where the problem lies.

    Incidentally, I came across this neat tutorial on the 'Levels' tool in Photoshop which suggests it isn't always right to just drag the sliders left and right to the edges of the histogram:
    Using the Photoshop Levels Tool

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    Senior Member willsud's Avatar
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    After more experimentation sticking with the MR Sky in the 3dsMaxDesign daylight system and rendering with iRay, and picking a good time of day seems to give the best results in the Levels dialog in Photoshop so I'm seeing more consistently 'bright' results.

    I never let renders go beyond 30 minutes so iRay does well enough for my little jobs
    Attached Thumbnails Attached Thumbnails Renderings out of Revit linked to 3dsMaxDesign always missing some 'Level' in PS-yard-entrance.jpg  

  10. #10
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    Quote Originally Posted by willsud View Post
    After more experimentation sticking with the MR Sky in the 3dsMaxDesign daylight system and rendering with iRay, and picking a good time of day seems to give the best results in the Levels dialog in Photoshop so I'm seeing more consistently 'bright' results.

    I never let renders go beyond 30 minutes so iRay does well enough for my little jobs
    I like the corner detail, looks like a box joint used in drawer construction. That's a house that the Big Bad Wolf couldn't blow down for sure
    willsud likes this.

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