1. Join Date
    Jun 2016
    Posts
    1
    #1

    Vray Matte Issue

    Hello,

    I am sure people have faced similar issue and I want to know your workaround for this problem.How do you render people and cars in architectural walk-through/animation in separate pass ?
    The way I started is
    --I rendered out the main sequence.
    --I've place cars and people in the scene.
    --Select whole scene except cars & people, & turn them into matte objects via Vray properties.i.e. by checking 'matte object', alpha contribution to -1, 'Shadows' & 'Affect alpha' checked.Of course I can achieve this by applying VraymtlWrapper but I want to this way for now.
    --Rendered the scene & I face 2 issues.

    Issue 1) All cars, people & their shadows have blue tint on them because of Vray sky which i can fix in post but is there any other solution to this ?
    Issue 2) When cars & people are under direct sun their shadows are OK but when they go under shade of a building or tree they still cast harsh shadows on ground as if building or tree isn't there.

    To make you understand it better I will explain it in a simple scene.I've created simple plane as ground, a wall and 2 boxes as people ( one in shade & other under direct sun).Both boxes are on the right side of the wall and I've placed sun on left side so that wall would cast shadow on one of the boxes.

    Attaching 3 images.First image '01.png' is the pass of 2 boxes (see the box under shade is creating harsh shadow like there is no wall),
    --second image '02.jpg' is what I am getting after compositing 01.png and main scene,
    --third image '03.jpg' is what I want to get as final result after composting.

    I have tried to find various solution like rendering ground with the cars and people.I got the shadows right but for some reasons the rendering become very slow and alpha of the rest of scene is somehow got affected.To counter this, I switched off 'Recieve GI' of rest of scene.The rendering time & alpha got fixed but image was very dark which was expected.

    So what is your solution ? what process do you follow ? Am I doing it right ?


    Thanks in advance,

    AB.




    01.png
    02.jpg
    03.jpg
    Last edited by phoenixkiller; 2016-06-07 at 11:06 AM.
  2. Join Date
    Jul 2015
    Posts
    2
    #2

    vraymtlwrapper issue with vray sun and dome light.

    I have an interior scene with 3d furniture placed in it. And I am using vraymtlwrapper on wall and floor so that I can mask it in post production. Everything is working fine but when I used dome light or vray sun through windows, the objects that are not under direct sunlight still cast shadow. I have no idea how to solve it. Do any one have solution to it?
  3. Join Date
    Jul 2015
    Posts
    2
    #3

    Have you found any solution to it? Vraymtlwrapper and sunlight together cast shadow, the objects that are not in direct sunlight
  4. Join Date
    Jan 2020
    Posts
    4
    #4

    Quote:
    Originally posted by: phoenixkiller
    Hello,

    I am sure people have faced similar issue and I want to know your workaround for this problem.How do you render people and cars in architectural walk-through/animation in separate pass ?
    The way I started is
    --I rendered out the main sequence.
    --I've place cars and people in the scene.
    --Select whole scene except cars & people, & turn them into matte objects via Vray properties.i.e. by checking 'matte object', alpha contribution to -1, 'Shadows' & 'Affect alpha' checked.Of course I can achieve this by applying VraymtlWrapper but I want to this way for now.
    --Rendered the scene & I face 2 issues.

    Issue 1) All cars, people & their shadows have blue tint on them because of Vray sky which i can fix in post but is there any other solution to this ?
    Issue 2) When cars & people are under direct sun their shadows are OK but when they go under shade of a building or tree they still cast harsh shadows on ground as if building or tree isn't there.

    To make you understand it better I will explain it in a simple scene.I've created simple auto clicker plane as ground, a wall and 2 boxes as people ( one in shade & other under direct sun).Both boxes are on the right side of the wall and I've placed sun on left side so that wall would cast shadow on one of the boxes.

    Attaching 3 images.First image '01.png' is the pass of 2 boxes (see the box under shade is creating harsh shadow like there is no wall),
    --second image '02.jpg' is what I am getting after compositing 01.png and main scene,
    --third image '03.jpg' is what I want to get as final result after composting.

    I have tried to find various solution like rendering ground with the cars and people.I got the shadows right but for some reasons the rendering become very slow and alpha of the rest of scene is somehow got affected.To counter this, I switched off 'Recieve GI' of rest of scene.The rendering time & alpha got fixed but image was very dark which was expected.

    So what is your solution ? what process do you follow ? Am I doing it right ?


    Thanks in advance,

    AB.




    01.png
    02.jpg
    03.jpg
    i am also facing this same issue don't know how to solve please help me.
    Last edited by MPatterson; 2020-04-15 at 05:25 PM.
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