The object in the animation does not fade away at the end in 3D viewer

[Anonymous]

I have done an animation where the object fades away at the end. But when I save the file as a .fbx and play it in 3D viewer, the object does not disappear at the end. I really need that feature as I want to import the animation into Dynamics 365 Guides. And in that software only few file format works.. I imported the file and the same thing as in the 3D viewer, the object does not fade away. 

Why is that? 

[leeminardi]

What technique did you use to do the fade.  Some render engines do not support a visibility track (e.g., Arnold) and other methods have to be used.  I have had some success using an opacity map (fully black bitmap) to control visibility.

[Anonymous]

Hi leeminardi  thanks for reply.

I changed visibility under object properties. 

Is there another way to do it so it can be imported like that in other programs?  I use 3D viewer to see how it looks. 

I don´t know about opacity map.

Best regards, 

[Anonymous]

Hi again, 

I tried doing the animation the Opacity Maps- way, but it still doesn´t show the object fading away in 3d viewer. 
When i save the file as .fbx I use default settings. Maybe I should change something when saving it? 

[leeminardi]

Are you using a visibility track as I demo in this old tutorial I created several years ago before I was aware of renderers that do not support a visibility track?  If not, try this out first and see if your viewer supports it.

If not, then we can talk about using an opacity map.

[Anonymous]

Hi Lee

Thank you very much for the tip to a very good video.

Maybe that´s the problem: when I render the object where it should be invisible, it is still fully visible (I have followed your instructions). However, when I drag the time slider to different keyframes, the object do becomes invisible.
I do not know which setting(s) may be incorrect. However, I look at your settings and mine are the same except down at the Motion bar, where it will be None under Enabled when I select By layer. Do not know if this can have any significance? 

[leeminardi]

If the object becomes invisible when you use the time slider but does not become invisible when you render a frame then the problem is most likely that the render engine you are using does not support a visibility track.  Neither ART or Arnold support a visibility track.  What renderer  are you using?

As I mentioned before you can use an opacity map (a.k.a. cutout map) to effect a fade with a little creativity. You cannot animate the amount of cutout but can animate the location of the map.  See this link where I used a cutout map to reveal an object.  For a fade effect it might work to scale a black and white half tone image.   If interest I could explore this further and post a possible solution.

[leeminardi]

In the attached file I have animated the position of the planar UVW map gizmo for the teapot.  Move the time slider and you will see it turn invisible from top to bottom.  If you select the teapot you will see the UVW Map gizmo move.

Try out this file with your software and see if this method works.  If it does we can change the effect from the moving of the "invisible zone" from a line moving down the object to the growth of halftone dots to create a fade effect.

A sample radial halftone screen. Scaling this map might generate an acceptable fade.

[Anonymous]

Hi Lee, 

Thanks for the file. When i save it as an .fbx-file the animation still doesn´t work. Nor does the colour. It is silver in the 3D viewer. Maybe i have wrong settings when i save the file? Did you try it in 3D viewer app? 

[leeminardi]

I do not have the 3D viewer app. Where can I download it?

[Anonymous]

From Microsoft Store

https://www.microsoft.com/en-ls/p/3d-viewer/9nblggh42ths?activetab=pivot:overviewtab