VRaySceneModifierInterface motion blur

[CGEV]

hi again!

a have a VRayStaticGeomSource/VRaySceneModifierInterface plugin that converts a file containing particle positions/velocities into a GeomParticleSystem plugin... everything works fine for non motion blurred images, but when i turn motion blur on, my particles disappear; my first guess was that the "velocties" attribute would be used to compute motion blur, but my particles disappeared so i tried to interpolate positions but get the same result... anyone encountered the same problem? btw my starting point was the "vray_geommeshloader" example.

thanks!

[vlado]

Is the parameter that holds the positions/velocities called and does it return the correct things for the specified time moments?

Best regards,
Vlado

[CGEV]

hi!

yes the parameter is called 2 times for nSample= 2, 4 times (?) for nSample= 3, and 3 times (?) for nSample= 1...
And btw the sample count (for the node) is set manualy in the exported vrscene because it's always set to 1 when exporting from maya

[CGEV]

ok i think i've figured it out... you need an "ids" attribute in the GeomParticleSystem to get motion blur...

[vlado]

Ok, we should probably add that somewhere in the parameter descriptions, thanks for the pointer!

Best regards,
Vlado

[CGEV]

You're welcome
Motion blur is working now, but i still have to modify the "nsample" of the node in the vrscene manually, because it's always set to 1 when exporting from maya... is there a particular attribute to set in maya? do i have to change the value from inside the VRayStaticGeomSource/VRaySceneModifierInterface plugin? if so how do you do that?

thanks!

[vlado]

It is 1 as the V-Ray translator doesn't know that your object is animated. However this is just a hint to the plugin, it can use other values if it is needed.

Best regards,
Vlado