Cheetah3D 7.0 - Early Adopters Beta Test

Empty boolean union

I've really been enjoying the upgraded booleans in v7. However, I'm running into an issue (in both b19 and b20).

The attached .jas file shows an empty union. But turning off the creator tags shows the original geometries aren't empty.

Thanks for any help.
 

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  • emptyunion.png
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  • GBNunion3-nobevel.zip
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This won´t work because of its intersecting geometry.
I´d skip the bevel/chamfer - make the 2 keys editable - select front and back polygons - make inner extrude and pull out for a nice bevel.
Align everything to your liking and boolean will work as expected: file attached.
When you use ->Polygon->Boolean instead of modifier/creator add it will maintain material assignments BTW.
Both extrude objects are labeled "watertight" - but it won´t help with Boolean operations in this case.
(You introduced some scaling issues too - but I don´t think it´s the problem here.

Cheers
Frank
 

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  • IntersectingGeometry.png
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  • GN.png
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Background Image Color Change

Anybody know why C3d is changing the color on a background image? The original image has a lot more saturated wall color. I used the Cheetah Renderer on this one with HDRI. I didn't think any of the render settings would effect a background image though. ?
 

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Change Color Tint Caused By HDRI

Hi Swizl

I don't know if this will help you any. Last week I was trying to render a white image. I was using the “oldtown_pano_sm” image for a HDRI.
The image kept rendering blue instead of white.

By trial/error and accidents i was finally able to achieve my goal.

I made lots of notes.

I've included a pdf in this post.

My Best
Jeanny
 

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  • Change Color Tint Caused By HDRI.pdf
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Jeanny said:
Hi Swizl

I don't know if this will help you any. Last week I was trying to render a white image. I was using the “oldtown_pano_sm” image for a HDRI.
The image kept rendering blue instead of white.

By trial/error and accidents i was finally able to achieve my goal.

I made lots of notes.

I've included a pdf in this post & I'll post again with two more pdf's.

My Best
Jeanny
Click to expand...


Thanks for responding. I'll check it out. I'll have to test it in v6 and see what it does. Not good though IMHO to have the background image change color.
 
Jeanny said:
Sounds like a necessary heads up. What is an IMHO?
Maybe I should find another avenue my self.
I don't want to run into problems down the line.

My Best
Jeanny
Click to expand...

My solution was to set up the scene with the image in the background. Then I rendered the scene with only the 3d stuff and a transparent background. I saved the image as a png. Then I composited them in Photoshop. Paste in Place makes it easy when the resolution is the same for both images.
 

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  • Earth Science.jpg
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Swizl said:
My solution was to set up the scene with the image in the background. Then I rendered the scene with only the 3d stuff and a transparent background. I saved the image as a png. Then I composited them in Photoshop. Paste in Place makes it easy when the resolution is the same for both images.
Click to expand...
Once again in slowmo: In essence you´re saying with just the appearance of the the poster on the wall the tint of the whole room is changing? I doubt that.

Cheers
Frank
 
frank beckmann said:
Once again in slowmo: In essence you´re saying with just the appearance of the the poster on the wall the tint of the whole room is changing? I doubt that.

Cheers
Frank
Click to expand...

It's changing even when there isn't anything else in the scene. Can you see the two images I posted next to each other? The first image has nothing to do with C3d. It came from iStock. The only thing I did here was reduce the size so I could post it. So there still should be an explanation of why C3d is changing the color so drastically?
 
If you´re using it as a camera background it really doesn´t matter which kind of hdri you´ll use for lighting BUT if you mapped this image to a plane it will receive all the light&tint from the hdri - so that is normal. If you need just the lighting info/power from a specific hdri you´ll need to desaturate the color from the hdri:

Cheers
Frank

Just more infos on that topic: http://www.cheetah3d.com/forum/showpost.php?p=101190&postcount=167
 

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frank beckmann said:
If you´re using it as a camera background it really doesn´t matter which kind of hdri you´ll use for lighting BUT if you mapped this image to a plane it will receive all the light&tint from the hdri - so that is normal. If you need just the lighting info/power from a specific hdri you´ll need to desaturate the color from the hdri:

Cheers
Frank
Click to expand...

The backplate in this instance is a photo that was applied to the camera. The HDRI is a studio lighting that is mostly grey. There may be some slight color tinting on it, but it would be minimal. That's why I don't understand why the color is changing? Unless C3d loads all images as a certain RGB color space? I'll try saving out the image tomorrow from Photoshop and see if it makes a difference.
 
Swizl said:
The backplate in this instance is a photo that was applied to the camera.
Click to expand...
That is totally strange: I applied 4 very different HDR images to the scene and the camera background image is totally unaffected due rendering.
Can you upload the complete scene compressed?

Cheers
Frank
 
frank beckmann said:
That is totally strange: I applied 4 very different HDR images to the scene and the camera background image is totally unaffected due rendering.
Can you upload the complete scene compressed?

Cheers
Frank
Click to expand...

Thanks again Frank for looking in to it. I'll attach the file tomorrow, since I'm home from work now. I may only be able to send part of the background image though since it was bought off of iStock.
 
Swizl said:
I'll attach the file tomorrow, since I'm home from work now. I may only be able to send part of the background image though since it was bought off of iStock.
Click to expand...
I can use the preview of that image - I think more important is the HDRI. ;)
(I guess you have my email address)

Cheers
Frank
 
frank beckmann said:
I guess you know you can map an image to a solid color shader and it won´t interact with lights at all?!

Cheers
Frank
Click to expand...

No I didn't think about that. I do have to match perspective, so I don't know if it will be more difficult putting the image on a plane?

Anyway, here is the 3d file with the HDRI I'm using. The HDRI came from SurfingAlien (Alessandro) in a post from a few years ago. I use it for most of my renderings because it doesn't give a strong color cast to the renders. I removed all the textures to make the file smaller.
 

Attachments

  • Earth Science.zip
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It works here out of the box:
There must be something else on your side. HDRI tinting only affects scene object but not camera background image color:

Cheers
Frank
 

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  • MatchRender.jpg
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frank beckmann said:
It works here out of the box:
There must be something else on your side. HDRI tinting only affects scene object but not camera background image color:

Cheers
Frank
Click to expand...

Thanks for the help on this.

I think I've tracked down the problem. The color profile for this one image is ProPhoto RGB. It seems from reading the wiki on it that it supports a wider gamut than the typical sRGB. When I convert the color space profile from ProPhoto RGB to sRBG IEC61966-2.1 in Photoshop, it loads into C3d properly.
 
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