OTOY Forums

Scog wrote:

Diogo Moita wrote:Radiance,
Please consider the implementation of fresnel effect on reflective materials. The lack of reflective fresnel effect gives an amateur look to architectural scenes, especially on interiores. It´ll be highly appreciate!
Thank you
Diogo

Another vote for this.
I have asked before but I don't know if it has just been overlooked or if there is some other reason it has not been added yet.
It does not seem like it should be a difficult thing to add, but not having the skills myself it is difficult to know for sure.
Fresnel reflections can make a huge difference in the realism of a number of materials.

what I understood is that Octane materials are physically correct (BRDF, http://www.cs.princeton.edu/courses/arc ... p/wynn.pdf)
Probably Octane needs a presets material to choose the correct reflection roughness balance, In fact we can tweak parameters freely creating materials that don't exist in nature.
Fresnel is only an effect to create different changes of BRDF rules. It depends from camera (eye) position and objects normals.
I think that Refractive should code these mathematical rules to create cloth and painted car materials. In fact many painted car materials have nano oriented prisms that diffract lights with rules.
These complex multilayered materials can be coded with algorithms.

Fresnel is linked to the Index of refraction for a material. If you have the correct ior, then the fresnel reflections will automatically be correct as well.
Because of this, it could be added transparently for specular materials without adding another slider to tweak.
Fresnel reflections are also a property of other materials such as metals or ceramics, which despite being opaque still have an ior. Iirc, this is determined by measuring the fresnel characteristics of a sample.

The effect can be subtle or sometimes quite dramatic, and very much a necessity for any photo realistic renderer.

is there any screenshot for instancing...... any date? you know we are about to lose biggest job ever in our company history because of lack of instancing.. quite depressing

Can't you use other software? Maybe even Cycles, which already has instancing? With some clever compositing you could always get the best of both worlds.

daniel ... it was my mistake i spoiled the client with lots of octane renders -- he wanted to make whole project and we are working on it for last 2 months ... no matter how we reduced polygons - cheated in every possible - no go .. without instancing we gotta turn back to our native 3D renderer for this project.

Would be so nice to hear a date though. May be i can convince the client.. ... thanks

tyrot wrote:daniel ... it was my mistake i spoiled the client with lots of octane renders -- he wanted to make whole project and we are working on it for last 2 months ... no matter how we reduced polygons - cheated in every possible - no go .. without instancing we gotta turn back to our native 3D renderer for this project.

Would be so nice to hear a date though. May be i can convince the client.. ... thanks

can you describe the scene? maybe someone else has an idea how it could be done; is there really no possibility to split it? have you tried mootools polygon cruncher yet? http://www.mootools.com/plugins/us/polygoncruncher/

another option may be a card with more ram; how close are you to the vram limit? i saw once a cheap gtx 550 with 4gb ram, and if the job is that big & important, maybe even the cheapest quadro 6000 with 6gb ram might solve the problem - both not too fast, but if they could get the job done...

thanks t_3 i ll look for those cards ... Thanks indeed...

tyrot wrote:thanks t_3 i ll look for those cards ... Thanks indeed...

i was also looking for it; seems that a 550/4gb is not really available anywhere, but the q6000 (in fact a gtx 470 with 6gb ram) could be the solution (and it only costs 5 times a standard gtx 470 ;) i though have no idea how you can assure that those gigabytes are enough prior buying such a card:

http://geizhals.at/eu/554823
http://geizhals.at/eu/673480

So whats going on Rad? Any news?

I just hope for SSS soon. I have some demon skin to render...