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Thread: image size-rendering time in vray

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    Senior Member anindia's Avatar
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    Default image size-rendering time in vray

    i ve tried to render ny image in 2000x1500 pixels in max. then assigned the vray rederer. fixed rate, gi on, and other lighting values assigned. but even after long hours it can not complete its pre passes. is this because of the high resolution assigned? but for a4 quality printing i need to render it atleast in the 1800 pixels rather than 800. i usually make tiff out put with 150 pixels/inch assigned. but that seems impossible to me to render with vray.
    i don't know how can i manage the rendering time. can any one help me?
    i am using p4-2.8 mHZ hiperthrading processor, intel 965 gbl mother board, 1.5 gb ddr ram(400 hz) and 128 mb gforce grafics card.
    after wards i ve assigned 800x600 pixels and render it again. but then it takes hardly a few minutes to cimplete the rendering.(20-25 minutes). i am ver ymuch confused.
    another thing i must mention that, i use 3d max 7 with vray demo. the image i ve rendered with 800x600 pixels, i am attaching below.
    i ve used ies sun light(1) with vray shadows.
    but if this problem persists (i can not render higher resolution images) i will be helpless.
    Attached Images
    We create,therefore we are....................;)
    http://www.coroflot.com/sbaspectra

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    Senior Member chuck's Avatar
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    Chuck Morgan
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    Default Re: image size-rendering time in vray

    can you post your settings?

    typically you can get away with a lower quality GI setting as the image size grows, but that has limitations...
    hariprasad likes this.

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    Senior Member anindia's Avatar
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    Default Re: image size-rendering time in vray

    in the render common parameter out put size 2000x1500 pixels, save to file was assigned to tiff(with 150 pixels/inch,8 bit color).no advanced lighting was assigned. in render scene that was vray demo 1.47.1--- in the renderer parameter of vray i ve used fixed rate with value 1,gi on, both reflective and refractive was on and default value was there.in the primary bounce i put 1.5 and secondary value ,.65. primary-irradiance map and secondary mon--- by default. envionmet- override max turned on default colour, and value was 1.1.
    in max i ve used ies sun with 500 lux and in shadow i ve used vray shadow sphere with u size 1500. camera was target camera.
    i didn't understand what u suggest be reducing common parameters with larger size out put. and another problem the edges become cripped. is that for antialiasing? how can i overcome that?
    We create,therefore we are....................;)
    http://www.coroflot.com/sbaspectra

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    Default Re: image size-rendering time in vray

    Why not try to save your prepass maps as a 800X600, bump your resolution up to whatever size you want, then load the saved prepass calculations? It'll render your image starting at the render stage and bypass the prepass stages. I'm not sure if you tried this or not, but that's what I do for 3600X2400, 100dpi images and it works fine.

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    Veteran Member kippu's Avatar
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    Default Re: image size-rendering time in vray

    do the tutorials .... read whats the different values are for .. the main thing in the settings is irrmap settings and lightcache if u are using ... and fixed rate antialiasing will give you jagged edges .. try adaptive subdivision ...

    do read more about the renderer and then do some tutorials and read the help files and then experiment

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    Member abl_langs's Avatar
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    Default Re: image size-rendering time in vray

    Hi, i think you should to use Vray trial version instead of the demo version..
    In the trial version, you can have a lot of control just like the full version, you can change the sample settings settings that greatly affects the rendering time..

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    Senior Member Parker1's Avatar
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    Default Re: image size-rendering time in vray

    Anindia,
    I just rendered an image last night at 4500x2953 pixels with V-Ray and had no problems. I have MAX 8 with V-Ray 1.47 and used a Dual core AMD FX64 box with 3GB of ram. It took nine hours total to prepass and then render. I used Adaptive QMC A.A., Irradiance map for primary & light Cache for secondary, one target direct light with V-Ray shadows and an HDRI environment. Are you using all V-Ray materials?
    Brian M. Parker
    Cooper Carry & Associates
    3520 Piedmont Rd. N.E.
    Suite 200
    Atlanta, GA 30305-1595
    Office: 404-237-2000 ext. 477
    Fax: 404-240-9596
    www.coopercarry.com
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    Default Re: image size-rendering time in vray

    IES sun may be one of your problems.

    I had an unexpectedly long render go down by more than 1/2 by only switching the IES sun for a direct light with soft vray shadows.

    Hope that helps.

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    Default Re: image size-rendering time in vray

    i suggest to you irradience map as primary bounce and light cache (or QMC) as secondary bounce. i have same system config as you do, also i suggest to save the irradience map and then reload that. it will bypass your prepass calculations. but sorry i have no idea of saving irmap on low res and use it for high res

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    Default Re: image size-rendering time in vray

    hey jophus14
    can you tell me how to use low res irrmap and use it to render high res renderings? its pretty much interesting

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