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Thread: 2017 Rendering - DPI setting is ignored?

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    2017 Rendering - DPI setting is ignored?

    I don't understand what is happening here - it looks like the image was rendered at quarter resolution and oversampled to arrive at the specified pixel dimensions.

    Blow-up of detail, note the "stair steps" on the shadow edges are 4 pixels tall:
    2017 Rendering - DPI setting is ignored?-aa.png

    I'm also losing detail (this is a tile texmap) at places where I have more than enough pixels to cover it:
    2017 Rendering - DPI setting is ignored?-reveals.png

    I'm scratching my head as to why DPI does not seem to equal DPI... What did I set or do incorrectly to make this occur?

    Render Settings (v2017.1):
    High, Printer, 300DPI, 16"x4.5", Exterior:Sun Only, Sky: Few Clouds.

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    Senior Member Alex Page's Avatar
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    Can you upload the whole image? When you say it was rendered at quarter resolution, why do you think that?
    What is the rendered image final size - since quality is DPI x number of inches so even if its reporting a lower DPI you might find the physical dimension is bigger than the 16"x4.5" you state above

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    Rendered image final size is 4799x1416; what I'd expect for DPI x print size.

    I think it's rendering at quarter (the diffuse and shadow pass at least) because the shadow aliasing does not match the overall image sampling aliasing (shadow stair-step is 4 pixels high). You can see discreet pixels of different colors within the 4-pixel stair step - why wasn't the diagonal better anti-aliased? Also, it was an old rendering trick to perform most of the calculations at half- or quarter- resolution and bump up your image sampling to compensate (with mental ray, at least). So, the artifact looked familiar.
    Attached Thumbnails Attached Thumbnails 2017 Rendering - DPI setting is ignored?-poor-aa-full-.jpg  

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    Senior Member Alex Page's Avatar
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    Maybe you need to try "Best" or at least manipulate the settings.

    2017 Rendering - DPI setting is ignored?-renderquality.png
    Have you tried rendering on the cloud?
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    Quote Originally Posted by Alex Page View Post
    Maybe you need to try "Best" or at least manipulate the settings.
    I was hoping someone had a more nuanced insight of the compromises the rendering engine is making under the hood.

    Quote Originally Posted by Alex Page View Post
    Have you tried rendering on the cloud?
    I'm not convinced that throwing money at a solution to fix the solution previously purchased is a wise path; this isn't a horsepower issue.

    What I have so far:
    Tried at "Best" - same issues, plus an unworkable timeframe (overnight).
    File was upgraded, so I tried a brand new 2017 file - same issues.
    Found this: Help, tried render by level (even though "Best" IS rendering by level) - same issues.
    Tried rendering "Until Satisfactory" - error dialog confirmed, will not render.
    Tried rendering Medium, High, Best - render completes, but same issues.
    Tried rendering region - no issues when region is smaller than 2048 pixels wide.
    Tried lowering resolution below 4096 pixels wide (per help) - same issues.
    Tried lowering resolution below 2048 pixels wide - no issues.

    So, 2048 pixels gives Revit / Autodesk Raytracer a maximum rendered image physical size of 13.65 inches at magazine (150dpi) resolution. Large images have to be rendered by region and combined in post?

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    Forum Co-Founder Twiceroadsfool's Avatar
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    I would try making the image size itself, larger. And make the DPI lower. I get what you are saying, that it *shouldnt matter* because its the "same math" but i have seen weird differences, with the DPI controls.

    Ive got a bunch of renderings in the 4200 x 2200 range, and they dont exhibit that behavior. There are pixels you can see if you keep zooming in, but you have to zoom in pretty darn far, before you see the degradation.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    1234567890.
    Attached Thumbnails Attached Thumbnails 2017 Rendering - DPI setting is ignored?-camera-outdoor-living-space-3.jpg  

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    I re-rendered at 4x physical size and .25x DPI (64" @ 75dpi). Same issues.
    2017 Rendering - DPI setting is ignored?-75-dpi.jpg

    I'm going to guess that the "memory storage" limitation mentioned in the help does indeed refer to the video memory (this is a K600, 1gb), and Twiceroadsfool has a more recent card with greater than 1gb ram. Also, the rendering posted is under the 4096 pixel limit (for greater than 1gb memory). The AA i'm seeing on that image is consistent with what I would expect - it's 1 pixel tall, not 2 or 4. I would be curious to see if you have a rendering over the 4096 pixel dimension that would exhibit half-scale calculations.

    At any rate, I've submitted a ticket to see if I can get some clarification from Autodesk on this issue. Will update with what I find.

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    Forum Co-Founder Twiceroadsfool's Avatar
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    Here is one thats 5400x2400, or something close. I zoomed in on it, and the AA in the shadows looks plenty good for what i do with the images. Its hard for me to tell (on this screen), what you might be looking for. So it might have the issue you describe, it might not.

    The renderings were done on a machine with a k2100M (2gb) mobile card.
    Attached Thumbnails Attached Thumbnails 2017 Rendering - DPI setting is ignored?-3d-view-5.jpg  
    cellersick likes this.

  10. #10
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    Quote Originally Posted by Twiceroadsfool View Post
    Here is one thats 5400x2400
    Thanks for posting; appreciated. I do not see the same issues I'm experiencing. Looks like Autodesk Raytrace may indeed be using the video card for something. FWIW, I successfully worked around the issue by rendering regions and combining in post. In my case, I need to keep the maximum pixel dimension under 2048.

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