Motion vectors channel.

[egz]

The render effect automatically uses VRay's velocity G-buffer. You don't need to select any input source.

[plastic_]

any ideas why my object velocity isn't rendered?

this are all channels i get:

12.07.2004 22:28 22.962 test.Alpha.0075.tif
12.07.2004 22:28 21.140 test.Atmosphere.0075.tif
12.07.2004 22:28 311.192 test.Background.0075.tif
12.07.2004 22:28 21.140 test.Caustics.0075.tif
12.07.2004 22:28 120.230 test.Diffuse.0075.tif
12.07.2004 22:28 573.296 test.Global_illumination.0075.tif
12.07.2004 22:28 21.140 test.Lighting.0075.tif
12.07.2004 22:28 1.050.560 test.MTL_Color.0075.tif
12.07.2004 22:28 21.140 test.MTL_Transparency.0075.tif
12.07.2004 22:28 1.050.620 test.Normals.0075.tif
12.07.2004 22:28 1.050.594 test.Raw_GI.0075.tif
12.07.2004 22:28 21.140 test.Raw_light.0075.tif
12.07.2004 22:28 1.337.816 test.Real_RGB.0075.tif
12.07.2004 22:28 998.764 test.Reflections.0075.tif
12.07.2004 22:28 773.940 test.Refractions.0075.tif
12.07.2004 22:28 1.337.816 test.RGB_Color.0075.tif
12.07.2004 22:28 21.140 test.Self-illumination.0075.tif
12.07.2004 22:28 21.140 test.Shadow.0075.tif
12.07.2004 22:28 21.140 test.Specular.0075.tif
12.07.2004 22:28 28.550 test.Sub-pixel_weight.0075.tif

[Da_elf]

you need to use an RLA or FPR file output to store your motion vector info. its not stored in a seperate file for compositing. it is actually part of the file as a seperate channel. like alpha channel is a 4th channel to RGB images. then Velocity channel will be a 5th channel also z-buffer is stored the same way

[plastic_]

yeah but the other channels are also stored by the vray framebuffer...
i thought the velocity channels looks somewhat like the normals, lots of psychedelic colors...
as in the article on top of the thread.
Z seems to be missing too now that i look at it.
i had no luck with my first RLA/RPF try...nothing to extract in AFX...i will keep trying...

[vance3d]

the real smart motion blur 3.0 plugin allows you to use velocity information created from your 3d app but you need to convert the vectors to red and green info in order to use it. The plugin comes with psuedo code which I used to create a render effect script to convert the velocity channel to rgb but its darn slow.

If anybody wants it just let me know. It's rough but in the right hands I'm sure it could be polished a bit to work better and faster.

V Miller

[guest]

Give it to vlado, maybe he can make an addition to standart motion vectors channels.

[plastic_]

so there is no way to directly use the vray object velocity channel to calculate motion blur in afterfx or combustion?

[vance3d]

Cumbustion yes because it works with max and rpf files much better than AE.

AE no not without additional plugins

V Miller

[guest]

I cant find a way to use Vray output in combustion, I'm gettin some blueddy things but they should be more greener or browner.
vance3d can you show an example of using this channel in combustion with combination of ReelSmart mblur 3.0?

[vance3d]

cumbustion has an operator that directly uses the embedded velocity channel in rpf files (as long as you've switched it on). It does the same thing as image motion blur in max.

V Miller

[guest]

Exactly, C* makes the same dumb image blur as max, but ReelSmart Blur make it better (and faster)...

[C00PER]

So, as far as I understand... There is an "Object velocity" channel, stored inside RPF file.. It can be rendered by Vray. This channel can be used later in Combustion for "RPF Motion blur" filter. However this filter sucks.

On the other hand, Reelsmart Motionblur has two modes - simple, when it just blends pixels without any additional channels, and Vector mode, where it uses special RGB image, NOT VELOCITY CHANNEL inside RPF file.. So, the problem is to convert RPF Velocity channel into RGB image that REELSMART MotionBlur understands.

[vance3d]

cooper,

that is what my render effect does. But it does it very slowly.

v Miller