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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Paul Cloutier posted a discussion

nXtRender vs AutoCAD RT

My first try with nXt.Same models, same textures, same lights (ies 100W x 4).2 minutes render time.See More
Dec 25, 2019
Paul Cloutier replied to Paul Cloutier's discussion Material help !
"Hello Kevin Thanks. I will look at Yoooootube for more infos."
Dec 25, 2019
Kevin Lockwood replied to Paul Cloutier's discussion Material help !
"I used your mask (alpha) file as a mask in photoshop and saved out to png."
Dec 24, 2019
Paul Cloutier replied to Paul Cloutier's discussion Material help !
"Hello Kevin It's work with your .PNG file. Did you just SAVEAS a .JPG to a .PNG with a image editor ? Capture.PNG Render.png"
Dec 24, 2019
mike makki replied to Daniel Hargreaves's discussion Accustudio
"I can help daniel"
Dec 24, 2019
Kevin Lockwood replied to Paul Cloutier's discussion Material help !
"I'm not sure if you are applying the tree to the region as a decal or as part of a material. if a decal onto the region, I don't think AR will allow 2 decals. I guess you could stack them but I don't think one applies to the other…"
Dec 23, 2019
Paul Cloutier posted a discussion

Material help !

Hello...Need help for settings alpha for this tree bitmap.AutoCAD 2018.Thanks !See More
Dec 23, 2019
Daniel Hargreaves posted a discussion


I know this is hard to believe, but Accustudio is over 20 years old. It has been quiet for a couple of years now at the site. I'm looking to hand it off to the next generation. Is there anyone interested in working on the site and eventually taking over the ownership of it?See More
Dec 3, 2019

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