Wow, these options are amazing. I greatly appreciate your assistance. I am currently teaching a Simulations course and the new particle system, which is amazing, has me trying to reconfigure how I was doing things before.

You always deliver! I love the solutions for parv_01 and 02. Really opens up more possibilities. Thank you.

Thank you, I will take a look at the scene.

Dan

Hi, One thing that I would do using Thinking Particles and Xpresso is to give a particle a particle random value. For instance, assign each particle a random height between 800 and 2000 and when the particle reaches that random height, it would spawn new particles.

I have not figured out how to do that with the new particle system. I was able to use a Condition to determine whether the particle is Greater Than the height of 800 and then adjust the Chance to add randomness to that. But it is difficult to specifically dial in a range of values. I will still getting a few going higher than 2000 (I wound up just exploding those when they were past 2000).

Thanks, Dan

Is it possible to use the Stick Modifier to stick a particle group to another particle group?

For instance: If Group A is emitting large ball like particles, can it bounce on a platform that has tiny particles from Group B on it, and have the Group B particles stick to the Group A particles? The Particles from group A is using a geometry replacement with a Sphere through a Cloner object.

I tried placing the Stick to the B Group particle group. I made the Sphere a polygonal object and the added the Collider tag to the Cloner object. Strange thing is, the Group B particles will stick to the first Group A particle with the Sphere replacement, but not other Group A particles.
stickToParticle.c4d

Thanks, Dan

Fantastic, thank you.

Yes, this is the IRR using the Standard renderer. It looks perfectly fine in the Picture Viewer. Adjusting the Gamma in the picture viewer makes it brighter.

The issue is that the IRR in the viewport is dark and doesn't match the correct look in the Picture Viewer. I will reach out to tech support. Thank you.

Caching does remove the lag. It was only in the viewport during playback.
I'll be sure to cache to synch everything up correctly for viewport playback.
Thanks, Dan

I set up a simple particle replacement using a Cube parented to a Cloner Object - using the Particle Group as the Object.

When playing back, there is a bit of lag where the cubes lag behind the actual particle. When stopping the playback, the Cubes snap into place.

Here is an image capture of the cube lag with the particle during playback:

Here is an image after stopping playback when the cube snaps into place:

Here is the set up with the Cloner settings:

Thank you.

I have an older scene that renders the same way in C4D 2024 in both the IRR and Picture Viewer.

This same scene when opened on C4D 2025, the Picture Viewer renders the same way as in 2024, but the IRR is rendering dark. Guessing it is a gamma/ linear issue?

Here is the render in 2025 from the Picture Viewer:

Here is the render in 2025 from the Viewport IRR:

Color Management settings:

Viewport Settings:

Viewport Display Preferences:

Thank you.

I have also tried a third way by setting up a collision for the Parent Object Rock with a specific object Plane. And tried connecting the Collision with either the On or Enabled and tried with both the Rigid Body on the Voronoi and the Voronoi object, but niether worked.
https://drive.google.com/file/d/1NcyQFalgy-ZJBu8b-L_79D2eVNHkVjuy/view?usp=sharing

I just found the Glue function and tried applying a falloff with the Linear Field.
The object is staying glued together but when going through the Linear Field it doesn't break apart.

I am trying to have an object be a rigid body (new unified system) and be able to bounce around as one piece and then at a certain point to fracture.
I tried setting it up with a Voronoi Fracture and a Rigid tag and adding a Connector> Fixed. However, increasing the Force and the Torque does nothing (this does work with the Bullet System).

Then I was thinking if the Voronoi rigid object could stay together until it passes through a Field which would trigger the fracture but not sure how to set that up. I had seen some videos using a Mograph Selector but it doesn't seem to work with the new dynamic system.

Here is a simplified version of the scene:
https://drive.google.com/file/d/1YfPzJ-QT841-cURBB8dE-KbJ9n1Q1mVP/view?usp=sharing

Hi,
With the Bullet Rigid Body dynamics I was able to parent a number of objects under a Null; apply a Rigid tag to the Null object and make all of the children dynamic.

This doesn't work with 2024. Is this not possible with the new rigid dynamics system or am I missing something?

Thanks,
Dan

Thank you for the super quick reply.
Wow 23 gigs - that's crazy huge. I have students on both Mac and PC. I am guessing if a 4.5 gig file can't be opened it is a limitation of the students RAM.
Great to know, thanks again.

This looks like a great solution.

I have been using a Cluster added to the lid geometry that has a constraint on it to follow the eye control and gives a very similar look.

Hi, is there a limit to how large a C4D file can be? I know in older versions there was a 2 gig limit, where if the file size was over 2 gigs, it could not be opened by C4D.
Is this still true for 2023 or 2024 version?
Thanks,
Dan

I just hacked through the math, I think good enough to get it to work in my scene. Thank you again - great solution and Xpresso makes it so much easier.

Still just curious about the Film Move and Zoom tool - gettting back to original view. After looking at the docs - looks like the Film Zoom is automatically adjusting the focal length and field of view. I could get back to the original view returning my focal length back to 21mm. However, if I use the Film Move tool, I don't see a corresponding value to change to get back to the original view as with the Film Zoom.

Fantastic, thanks so much. Looks like it could work. I created an xpresso script to automatically adjust the size of the plane based on the distance from the camera. I just need to recreate in my scene. I am using a 21mm focal length so I will need to make some adjustements.

One additional question: If I am making moves with the Film Zoom and Move, is there a command to get a back to my original zoom level, my original view from the camera?

Hi, I am creating a 3D modification to a room using a photograph through the Background tab in a Redshift camera. I need more clarification to line up 3D objects to objects in the room. Is there a way to zoom into the viewport without moving the camera? To be able to increase the size of the viewport larger than 100%?

I tried using the Viewport> View> Film Magnify and Film Zoom but the background in the Redshift camera is not adjusted along with the scene.

Thanks,
Dan