AccuRender nXt

advanced rendering for AutoCAD

I had a case come up in the SketchUp forum which was a good example of a place to use Material Channels (A feature of nXtRender Batch). The user was trying to render a theater with a black carpet, and the carpet kept rendering as a light color.

I created a similar scene with black walls, and a very dark carpet and got a rendering like this:

I explained how I could lower the brightness from 50 to 40 to make the entire scene darker.  But, or course, this make the whole scene darker.

And then I explained how I could user Material channels instead to darken just the carpet.

Material Channels can be used to make small color and brightness changes after rendering. It is often used to bright something - like to make the ceiling in this image whiter - but it can also be used to darken the carpet.

1. After rendering, left click on a pixel in the carpet and select "Change Color":

The dialog box shows the current average color of the pixels in the carpet RGB(70,70,70)

Use the sliders to adjust the color of the carpet. In this case, I dropped it to 30,30,30 to make it darker, without making the rest of the scene darker.

This works by adjusting the color of every pixel rendered in that color, to match the new average color.

Because of anit-aliasing, reflections, and reflected light considerations, Material Channels does not work for making major changes - such as making the carpet bright yellow - but it can be used to make smaller, especially intensity, changes to a material.

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mike makki commented on Tibor K. Karsai's photo

WestlakeV - Copy

"good image and nice montage... the only thing is that the sky is too blue ... a light colour and would make it perfect"
14 hours ago
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Rich Hart replied to Paul Jackson's discussion Old versions of nXt for AutoCAD
"There is a bug in the logic to find the version with the closest date to your license number that occasionally finds the farm install instead. You should be able to simply download the install the NK21 or the OA30 version from the link I posted…"
Paul Jackson replied to Paul Jackson's discussion Old versions of nXt for AutoCAD
"Thanks Rich. I also popped-in my license code to the checker, it came up with nXtFarm64_0355.exe Seems to be the render farm though?"
Rich Hart replied to Paul Jackson's discussion Old versions of nXt for AutoCAD
"This page: lists all of the versions of nXt for AutoCAD currently available for download. The version from Nov 2014, NK21, will work with your license bought in 2013."
Paul Jackson posted a discussion

Old versions of nXt for AutoCAD

Is it still possible to download old versions (bought in 2013), of nXt for AutoCAD? Got a new PC, but cannot find my installation file. Thanks.See More
Roy Hirshkowitz replied to Peter Milner's discussion Reflected background brightness
"Almost certainly.  A fix may be difficult at this point.  The code has not been touched in years."
Aug 21

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