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Where is this white coming from?

jmucchiellojmucchiello Posts: 628
edited May 31 in Technical Help (nuts n bolts)

TL;DR An Iray section plane node causes a dress' interior to turn white. Where is it coming from?

I have a scene and I pulled the camera back through the ceiling. So I created a iray section plane node, set it to block light, put it just below the ceiling, made the ceiling invisible in viewport and went on with what I was doing.

Turned on IRAY preview and there's this white showing on the interior of this model's dress: https://www.daz3d.com/dforce-willow-dress-for-genesis-9

The white also appears when I do a full render. 

I switched to perspective view, which was just pointing head on to the figure, everything is fine. When the perspective view crossed the iray section plane node, the white appeared again. Hide the IRAY section plane node and the white goes away. If I move the camera so that the IRAY node is not longer between it and the figure, the white goes away. Hiding the node, the white goes away. It is definitely the IRAY node that is causing that texture to turn white. (Please don't tell me the dress is colliding with the chair. I know this. I've hidden the chair and it doesn't change how the texture renders.)

I tried deleting the dress and recreating it. Same issue. Where is this white coming from? I've included part the Glossy Color part of the texture for reference. I've also hidden the figure to show the white interior shows up in the entirety of the dress. Exiting and restarting Daz didn't change anything.

I can render the scene without the iray section plane node, but that is sub-optimal.

Any suggestions on what to look at would help. But, as long as the camera (or perspective view) passes through this node, the white appears.

Post edited by jmucchiello on

Comments

  • felisfelis Posts: 5,782

    Can't really imagine what can do that.

    What is the section plane blocking?

    What shader does it say on the dress?

  • WendyLuvsCatzWendyLuvsCatz Posts: 40,106

    have you got a white background and rendering jpg?

    If you have no background (and sky/dome not visible in render) and render png is it transparent?

    has the dress got an iray mat script applied?

  • jmucchiellojmucchiello Posts: 628

    felis said:

    Can't really imagine what can do that.

    What is the section plane blocking?

    Quoting myself: So I created a iray section plane node, set it to block light, put it just below the ceiling, made the ceiling invisible in viewport and went on with what I was doing.

    What shader does it say on the dress?

    Shader is a MAT that ships with the shop asset: https://gcdn.daz3d.com/p/90035/i/dforcewillowdressforgenesis904daz3d.jpg (This is the fourth promo image on the shop store page.)

     The plane is allowing me to move the camera through the ceiling.

     WendyLuvsCatz said:

    have you got a white background and rendering jpg?

    I only render PNG. Background? There's an entire chair under the figure and floor under the chair as you can see in the image. Look at the right hand side of the image I posted, you can see white on the back of the dress when her body isn't in the way. And in GIMP, the area is white, not transparent.

    If you have no background (and sky/dome not visible in render) and render png is it transparent?

    Render is Dome and Scene. There is no background. There's an entire wooden floor in the image I posted. And there is nothing transparent in the render.

    has the dress got an iray mat script applied?

    I have never in my life applied such a script ever. How would I find out if the dress has one? This is a store bought asset, link in the first post. What would such a script be doing that it turns only the interior surface of the dress white?

    Since folks asked, this is the surface data for the dress. But, as I said, it is the stock dress asset from the store item with a store provided material applied to it.

    Untitled2.png
    1189 x 801 - 183K
  • felisfelis Posts: 5,782
    edited May 31

    What happens if you turn 'Thin walled' On in the dress surface settings?

    Post edited by felis on
  • BejaymacBejaymac Posts: 1,942
    edited May 31

    At a guess it looks like your section plain is messing with Iray's ability to flip normals to face the camera, as those white areas are the backfaces of the mesh.

    Post edited by Bejaymac on
  • jmucchiellojmucchiello Posts: 628

    Bejaymac said:

    At a guess it looks like your section plain is messing with Iray's ability to flip normals to face the camera, as those white areas are the backfaces of the mesh.

     But why? And how can that be fixed?

  • jmucchiellojmucchiello Posts: 628

    felis said:

    What happens if you turn 'Thin walled' On in the dress surface settings?

    This did work. The white is gone when Thin Walled is On. 

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