AA again

[losbellos]

Hello,

I am working now on an animation with lots of vegetation.
I found an interesting point (maybe i am doing something wrong)
that with max scanline the antialiasing is much faster. In vray I tried all the AA samplers with all the AA filters. Here is two Test image of it. The first one is made with scanline, the second one is with vray.

takes 8 sec with scanline


takes 39 second - because of antialiasing.


I test them without AA, increasing the foliage (polycount) vray rocks, but when AA on it will be much slower.(?)

So I need only that level of antialising, which shows on the first image but much faster if possible.
Anyone could help?

[losbellos]

-
http://free.x3.hu/losalamos/scanline_8sec.jpg
http://free.x3.hu/losalamos/vray_31sec.jpg

[zerofractal]

I could not see your image, but I suspect the difference in time is due to Opacity maps. Vray has real a pain with opacity maps compared to scanline. Using vray mats w/ the map on the refractive slot and IOR set to 1 tends to be faster, but still it is very defficient compared to geometry sets.

Many people have asked for some kind of clip maps. Greg3D once said that with a minimum Vray displacement and water level this can be achieved. Havent tried it though.

[losbellos]

No I dont use opacity maps. It would be a simple geometry, a lot. Well on
this image just a few.
There must be something wrong I dont believe that max does it much faster. I'll post a sample scene next days.

[finish]

you guys should understand that 3ds renderer is a scanline renderer and vray, fR, brazil etc are raytracer

raytraced image sampler treat every pixel equally, while scanline sampling is somewhat dependant of the amount of geometry under the texture

try rendering a simple sphere with some bitmap on it with low poly count then with high poly count with scanline, then with a raytracer. you should notice a significant speed decrease with scanline, nothing change with a raytracer (for the render itself, not the scene preparation)

needless to say that raytrace image sampling is much more accurate and stable during animations (at least whithout undersampling)

[losbellos]

Thank for the reply, I know what is the difference between scanline and ray tracing, (at least roughly) but the Antialisaning speed is something different.

I am not talking about the speed of rendering in general, I am talking about the speed of antialiasing... Big difference(!)

these few thousand grass, on faster machines, would render (without AA) around the same speed. (i know when I am going to render, a million it will be much slower with Scanline) but now take this as an example,
Same rendertime without aa
AA on (video)
Scanline is at least 30-50% faster.
The shading with vary of course look much better, (cause its ray tracig) but I am just wondering maybe there should be some good solution for animation, something like as the Video filter works in scanline mode.
also this thing with the sampling. Probaly scanline does it different. Maybe less quality, but very sufficien for me.

anyway I got friendly to it and accept it, and count with it. I'll use vray of couse. No problemo. (I'll buy an other machine )
Thanks!