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Faint line appearing along edge of plane

ronbronb Posts: 11
in New Users

Using a black and white image in the "opacity strength" as a mask and often when in front of a dark background, faint line of the plane's edge appears in the renders. much of the time it also appears in the editing window. i've tried different image shapes and different sizes and .... well frankly i just don't know how to put it in words. i've checked enough times and the pixels all along the mask's edge are all 0 (black) and to me that means that it should be invisible there, yet a faint line still shows at the edge. will try to upload the first mask i used that got my attention. now if i can just get these faint lines to disappear .... anyone know what's causing this?
well drat it won't let me upload images

Comments

  • Richard HaseltineRichard Haseltine Posts: 109,705

    Daz Studio? Are you rendering with Iray or 3Delight?

  • ronbronb Posts: 11

    it has always said iray and nvidia. yes, playing around building stuff with the primitives in daz studio. is there a way to upload a picture here?

  • Richard HaseltineRichard Haseltine Posts: 109,705

    To upload a picture click Attach a file under the text entry box, then click the Browse button and select your image.

  • ronbronb Posts: 11

    i've tried that and strangely enough it tells me every time that jpg or bmp "uploaded file type is not allowed."
    since i've tried everything else, i've had some thoughts today of monkeying around with the shader controls and hopefully i will hit on what's causing it. what it reminds me of is the effect when light hits a clear sheet of plastic (more so than a pane of glass) and the sheet for the most part (excepting the reflection) appears invisible but then whatever light it absorbed is now appearing around the edges of the plastic. there's no way it's acting like that but it does appear like it. i've tried all different sizes and angles and lighting and nothing so far has any effect on it.
    the only alternative i can think of is to make my planes stretch beyond the limits of the scene and make the polygon mask a tiny part of the center of the image being used to modify opacity. that is going to make for some really gigantic jpg files. hopefully i won't have to go that route.

  • srieschsriesch Posts: 4,243

    I have that problem occasionally in 3DL.  It's like the opacity map is off by 1 pixel or something.  I don't have an example in front of me at the moment so I can't remember if this was a workaround or not, but try changing the X or Y tiling and/or offset just a hair to see if you can bump the problem out of view, let me know if that works.

  • ronbronb Posts: 11

    i'm going to try a few ideas tonight. one thing that i noticed is if the image in the mask is "off balance" or basically lopsided, it created a faint edge line opposite in the other side that should have been invisible. it occured to me today that in my experiments balanced images don't make those lines so if i extend the plane and the image i load into its opacity outward double or more than what i need, i'll be faking that balanced picture with what i need being a small part of the center and the outside edges being heavy in black (aka invisible). hoping it reduces the amount of line to something i can live with. wish me luck.

    anyone have any idea why this board refuses to let me upload images?

  • ChoholeChohole Posts: 33,604

    You attach images using the Attach a File button below the typing pane.   JPG and PNG  and I believe GIF  formats.  there are size limitations

  • ronbronb Posts: 11

    hmm the picture i was trying to upload was 1.3k in size.
    i did the first thing and doubled the dimensions of the plane and the mask being applied to it so the wanted white mask part was a small part at the center and the perimeter was a lot of black (invisible) space. it completely eliminated the artifact line.

    even after solving the problem i still played scientist and went through every shader control in default and uber and the only ones that had any effect on the edge line was the obvious, diffuse strength and opacity.

    then as i was quitting i discovered another weird artifact, in reflections i am seeing a white rectangle at infinity. i made a 'ghost hunter' camera with a black mirror and am guessing it is part of the environment lighting. will have to chase that white rabbit some other time.

    like sriesch said, it appears to be off by a pixel - or half a pixel. i guess something to not worry about unless your pushing the software to the limits it wasn't intended for. have fun :-)

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