island 19Billion poly on luxrender

[matali]

Hi all,
That thread : http://blenderartists.org/forum/showthread.php?249664-UPDATED-.bend-19-Billions-of-Polygons-not-a-ridiculous-number-anymore makes a lot of noise in the cycle community, and i wanted to try it on lux. But I don't succeed in making the same materials... Is there any script to take export cycles materials to lux materials ?
Thanks for your replies

Edit : in original thread i spoke about instancing problem too but it is resolved (fresh install of blender).

[SATtva]

Instanced geometry is working correctly unless you're trying to render in hybrid mode. As hybrid doesn't supports instancing, LuxBlend reverts to real geometry export.

[J the Ninja]

Cycles and Lux mats are a bit different, it would be hard to make an auto-converter that didn't require manual tweaking after the fact. FWIW, the scene renders fine in Lux, using 644MB of RAM here.

EDIT:

[matali]

Thanks for the reply,
How did you make it ? Redone all materials by hand ?
I hope the node API will make it easier, at least for the color texture to keep the UVs.
Using model/meterials library website allow to spare a lot of time, only if we don't have to rework everything except geometry. Is there maybe a format that could be used for inter-operability ? Obj, collada...
A good side of opensource should be (in theory) interoperability, i hope we won't have to be bound to a renderer, because we don't want the hassle of the exporting problems.
That scene is pretty simple material-wise, but for more complexe scene, it could require hours of work.
Cheers

[B.Y.O.B.]

The scene exports fine for me and uses 360mb of 12GB RAM.

[J the Ninja]

Thanks for the reply,
How did you make it ? Redone all materials by hand ?
I hope the node API will make it easier, at least for the color texture to keep the UVs.
Using model/meterials library website allow to spare a lot of time, only if we don't have to rework everything except geometry. Is there maybe a format that could be used for inter-operability ? Obj, collada...
A good side of opensource should be (in theory) interoperability, i hope we won't have to be bound to a renderer, because we don't want the hassle of the exporting problems.
That scene is pretty simple material-wise, but for more complexe scene, it could require hours of work.
Cheers

Yeah, I just flipped through what the Cycles mats did and re-made it in Lux as best I could.

Unfortunately, the node API will help little, if at all. Cycles and Lux just have different material systems, and part of this is because they do not have the same design goals. This will probably never change. For example, don't expect anything like the Cycles "light path" node in Lux. On the same side of things, I wouldn't hold my breath for Cycles getting anything like Lux's "tabulated data" texture node.

Also, some of the differences come down to different choices in implementation details. For example, in Cycles, you have 2 nodes to set texture coordinates, "coordinates" and "mapping". Lux does not have these, these functions are built into the texture nodes themselves. Another example would be environment light. In Cycles, this is set for the "world". Lux does not have any true concept of a "world" object, environment lights are just an ordinary lamp object. (Which is why they are set with the hemi lamp in Luxblend).

[matali]

Thanks for the clear answer jason.
What a shame so many people model for cycles on blendswap.
I found a script on blenderartist that convert BI materials to cycle materials, i hope i'll have time to look at it and port it for lux in some ways. If we can remove 50% of the conversion work, it would be already nice and help for artist community work (and not split effort between "renderer clans"), as well as more freedom to move between renderers.
If someone else can have a look : http://blenderartists.org/forum/showthr ... tures-Node
Cheers

[zsolnai]

Does anyone still have a blend file with a LuxRender material setup for this scene by a chance ?

[B.Y.O.B.]

Maybe I still have it, I'll look when I'm at home again in about 12 hours.

[zsolnai]

Have you found anything perhaps, B.Y.O.B. ?