Rhino 8, Cycles, Renders look so different

Rhino 8

Rhino 7

The settings seem to be the same between R7 and R8.

Rhino 8 is about 4 times faster rendering.

Doesn’t Rhino convert non-cycles materials to versions compatible with cycles? Has the conversion code changed?

Have light dropoffs changed? I see much more light bounce off the hull, a giant, red-orange glow.

And I was relying on strange effects with glass that, perhaps, been fixed. For example: the further a light source is from the glass, the more light transmits through the glass.

Has anyone else noticed changes?

The file is very big so I’d need a link to upload if you want to see the file. I assume that McNeel peeps can open R8 files in R7 or can easily convert.

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This is it without the glass on the nacelles. Looks like a lot of the difference is in the glass.

I see more light on the hull. The reflections are amazing (like neon).

I’m of no use here, but I am happy to see another Star Trek modeller!

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I’d check to make sure all your light falloffs are set to how you expect- depending on which style you choose it can make a huge difference.

@jmcauley can you please share just the nacelle with me? If you don’t want to share publicly you can use Rhino - Upload to Support to do so confidently. My address is prefilled, I should get automatically notified when the upload is ready.

Lots has changed between v7 and v8, so it very well may be something I have missed.

I sent you a nacelle, forgot to zip it. I pressed the big red button then read the instructions. DOH!

Oh wow, I saw your ship, pretty amazing.

How did you etch the grooves in the hull, did you use booleans?

I will have another look later as I have to start work now.

Not-zipped is fine for me :slight_smile:

FYI in your export there are 5 nacelle block instances on top of each other.

If anything there is a problem with the rendering of the hidden material type Cycles Emissive:

Anyway, the strength is set to 0 for some reason.

I’d convert this to an Emission material in both Rhino 7 and Rhino 8 and use the orange/yellow hue you’re looking for.

In both Rhino 7 the copper heater materials changed to Emission with an orangey color. On the left Rhino 7, and the right Rhino 8:

I must admit I haven’t paid attention to the hidden Cycles-provided materials, so there clearly are differences there.

Also Custom material had some changes in Rhino 8, it is best to convert all materials in Rhino 7 to Physically Based materials, then they’ll look pretty much the same between Rhino 7 and Rhino 8.

Thanks Nathan,

I drag selected the nacelle and so picked up 5 copies without knowing it.

Getting rid of the five and mirroring the other gave me a single block and that, in itself, was a big improvement. Though I had to do the mirror in R7 as R8 seems to mirror the block around its own Y axis instead of the world Y axis.

Were the Cycles XXX materials a test feature from long ago?

I will need to convert to physically based. Time permitting.

As to the value being 0… it was actually 0.03

I found that I had to be quite creative with the numbers used to get the look that I wanted.

Those are kinda stop-gap materials before for instance Physically Based material and such existed. These were (and still are) possible to get by typing TestShowPrivateContent. That is why the material has an icon of an eye with red stripe through it.

Having done some test renders, it looks to me that R7 has a light that comes from the camera whilst R8 does not.



See how dark the rear section is in R8. And the frosted glass, logo is only lit by orange light but the R7 one has white light reflecting from it.

Didn’t you add a light to a scene if it had no lights? I imagine that I am getting the benefit of that in R7 and am missing it in R8.

I have a file here where when I use the Render command in 8.1.23325.13001, it does not copy post effects defined for the view into the render window post effects, so my render was initially much darker than expected

I have not yet investigated beyond just noticing this, but maybe it is something to check


I never use them myself. But, I bet there are a lot of small things people need to check to get back to what they are used to seeing.

I think I see two differences between R7 and R8:

  1. R7 had a bug in glass that made the light source dimmer, the closer it was to the glass. That has been fixed in R8. Either a bug was spotted or the glass replacement just hasn’t got that bug.
    You can see this easiest by looking at that orange pointy thing near the tip. It is shorter in the R7 render than it is in R8. The orange thing (its supposed to be a hot, glowing, thing) enters a glass tube where it goes dark in the R7 render. The R7 glass, bug/feature completely cuts out the light because it is too close to the glass. R8 lets the light through and you see the true end of the orange thing.
  2. R7 adds a light “from the camera” if you have no other lights in the scene. This is why you can see the details in the rear (its a beam tetrode with see through: beam formers, cathodes, and plates). That’s right, my warp engines are modelled on a part of a guitar amp :slight_smile:

I need the light back, or: I need to know how to make a similar light so I can place one at the camera, probably by writing a script to place it when I want to do a render.

I need the camera light specification.

If you didn’t have lights in Rhino 7, not even skylight, then indeed Rhino would add a default light - shining over left shoulder, camera based as you noticed.

This was changed in Rhino 8 partly because it caused incorrect behavior when it was not wanted.

I’ve logged a feature request: RH-78774 Allow user to toggle manually default camera-based light

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Thanks Nathan, that would be brilliant :slight_smile:

Hi everyone, I am having trouble with custom transparent materials in Rhino 8. I followed the Rhino 6 tutorial for the water glass: https://www.youtube.com/watch?v=3jUMGqlVslc. It used to work beautifully in V7, but in V8 my water looks solid black. This is not a coincidence artifact, and I have added lights to the scene, no difference. I also am finding the raytraced and rendered mode much slower than v7. Can someone help me? The preloaded glass material seemed to work fine.

here is proof of my light source:

Rhino 6 had a different render engine altogether. Rhino 7 and onwards have the render engine built on Cycles (from Blender fame). In Rhino 8 we updated to a newer version, and that also brought some changes, although most things still should render the same.

Anyway, either use one of the main material types or Physically Based, but stop using Rhino Custom. Just change its type from Custom to Physically Based to get the conversion started.

Could you please attach the model you’re working with, @Andrew26 ?