[Bf-cycles] Strange behaviour with pictures

[Christian Monfort]

Ok then (I guess I'll have to do what I'm up to in another way),

Thanks for quick answer.


2012/8/14 Thomas Dinges <blender at dingto.org>:
> Hi,
> Image Loading in Cycles goes via the OpenImageIO library, Image Loading
> in Blender goes via our own Blender code.
> It looks like Blender caches the image somehow, so Material & Texture
> view still work.
>
> OpenImageIO on the other hand reloads the image every time. There are
> some ToDos for Image loading via OpenImageIO, but this is not considered
> a bug atm.
>
> Regards,
> Thomas
>
> Am 14.08.2012 16:36, schrieb Christian Monfort:
>> Hi,
>>
>> I've discovered something using Cycles that I'll consider a bug unless
>> someone here tells me it's not (in which case I'll find it a bit
>> annoying):
>> it seems that Cycles needs to have access all the time to pictures
>> used in materials
>> if not - because the file has been removed/rename, or is not accesible
>> - the material is rendered all black:
>>
>> How to reproduce:
>>
>> 0) Start from default scene
>> 1) Switch to Cycles Render
>> 2) Open image in UV/Image Editor (let's say /tmp/pic1.png)
>> 3) Quick UV/Unwrap the cube
>> 4) In node editor, add a new material to cube (you should have
>> "Diffuse BSDF" & "Material Output" default nodes)
>> 5) Add an "Image texture" node, selected previously loaded image, and
>> connect Color pins from "Image texture" && "Diffuse BSDF" nodes:
>>     [ Image.Texture/Color ] <--> [ Color/Diffuse.BSDF/BSDF ] <--> [
>> Surface/Material.Ouput ]
>> 5) Set Viewport shading to "Rendered" in 3D view = > All is ok,
>> picture on all cube faces
>>
>> 6) Rename picture file on disk (/tmp/pic1.png => /tmp/pic2.png)
>> 7) All is still ok in 3D view,
>> 8) Set view port shading to something else than "Rendered" ("Solid"
>> for example),
>> 9) then back to "Rendered" => cube is all black... (But "Material" and
>> "Texture" shading modes are OK)
>>
>> Ok, maybe that's normal as we removed the picture file...
>> (but isn't the picture loaded in Blender somewhere? why Material &
>> Texture mode ok then?)
>>
>> 10) Rename back picture file to /tmp/pic1.png" and repeat 8) 9)
>> 11) => Picture on all cube faces
>>
>> Let's try something else...
>>
>> 12) In UV/Image editor Select "Pack Image" from "Image" menu, so that
>> all image data is embeded in .blend
>> 13) Check all is ok in "Rendered" mode, then repeat 6) 7) 8) 9)
>> 14) => Cube is all black...
>>
>> I may understand the 1st case (up to point 9) - but here I thought
>> that packing image made that Blender needed the original file no
>> more... and still Cycles do?
>>
>> Thanks for your time
>> (I don't want to open a bug report until I'm 100% sure this is not a
>> correct behaviour...)
>>
>> Christian.
>> _______________________________________________
>> Bf-cycles mailing list
>> Bf-cycles at blender.org
>> http://lists.blender.org/mailman/listinfo/bf-cycles
>
>
> --
> Thomas Dinges
> Blender Developer, Artist and Musician
>
> www.dingto.org
>
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