Easy-to-follow video tutorials help you learn software, creative, and business skills.Become a member

Limiting materials with selection tags

From: CINEMA 4D Essentials 4: Materials, Texturing, and Lights

Video: Limiting materials with selection tags

In the previous movie we applied this star to the wing of our MiG fighter here, but I only want the star to show up on top of the wing. I'd like to have a different material on the underside. So, in order to limit that material to just showing up on the top of the wing, I have to use a technique called a Selection tag. The way the selection tag works is that you first need to select some polygons. Then, once you've selected those polygons, you can identify them using a special tag that then gets used in the material tag to limit where the selection shows up.

Limiting materials with selection tags

In the previous movie we applied this star to the wing of our MiG fighter here, but I only want the star to show up on top of the wing. I'd like to have a different material on the underside. So, in order to limit that material to just showing up on the top of the wing, I have to use a technique called a Selection tag. The way the selection tag works is that you first need to select some polygons. Then, once you've selected those polygons, you can identify them using a special tag that then gets used in the material tag to limit where the selection shows up.

To begin our selection process, we have to go into Polygon mode, so I'm going to select Polygon mode here over in the left and then click on my cube. We're looking at the underside of the plane right now, and this is where we don't want it to show up, so we're going to select the polygons that are associated with the top side of the wings. Let's go over to the top of the wing. Now I've got a feature turned on called Isoline Editing, and Isoline Editing is causing the polygons to be deformed in the shape of the HyperNURB object. That makes it very confusing to see where the polygons actually are, so I'm going to go to the Options menu and uncheck Isoline Editing right here.

Now I can see just my plane shape, and this is the low-poly plane that's underneath the HyperNURB that's getting smoothed. I can also turn off my HyperNURB so I can just see the polygons that make up the wing. So what I'm going to do is use the Selection tool and grab just these polygons for the wing and I'm going to name them. Actually, I'll grab all these polygons that make up the top of the wing, and I'm going to call those polygons Top left wing. Anytime you name something right or left, it should always be from the object's point of view. When you're sitting in the plane as a pilot, this would be the left wing.

To get the Selection tag, now that I've got the polygons selected, I go to the Select menu, and right near the bottom is Set Selection. When I let go of that, I get this red triangle on the cube object, and this is the Selection tag. This stores that information right there. I can deselect those polygons. I'll click anyplace and deselect them. I can always restore the selection by clicking on it right there. I can name that selection. We'll call it Left wing top. Now I want to do the same thing for the right wing.

But before I do that, I have to be very careful. If do another Set Selection while I have that tag selected right there, it will overwrite the contents of that tag. I don't want to do that. So let's deselect that tag, click on the cube again, and then select the polygons that are on the right-hand side of the plane. So let's go to those polygons right there, and we've just got those polygons selected on the top of the wing on the right-hand side. Now I'll go back to the Selection menu and do a Set Selection, and then I can call that selection Right wing top.

Now, the way we use these is we have to identify which tag is which for the textures. Which one of these star textures is the one that's on the left and which is the one that's on the right? To do that, I can switch to the Texture tool and then click on a tag. So this is the one that's on the left-hand side, so it's going to get the left selection tag. So I go to my tags and this is the left selection. That's my left star. Sometimes people will take these and order them so they're right next to it. So there is my left tag for the texture. There is my left selection right next to it.

Now I can take this texture and in the Selection field that's on the Tag properties, I can drag that triangle right down, and there it is. When I let go of that and orbit around, you can see that the star is gone from the underside. Let's watch this as we do the same thing on the other texture. Click on that Star texture there, drag the triangle in, and there it goes. The star is now limited to just the top of the wing. When we orbit around, we could see that our stars still show up in the top, but they don't show up underneath. This technique is incredibly valuable and it can be used in all kinds of situations: putting labels on bottles or cans, in this case putting decals on models of objects, but it's a really valuable technique and one that you've got to keep in your toolbox.

Show transcript

This video is part of

Image for CINEMA 4D Essentials 4: Materials, Texturing, and Lights
 

Start learning today

Get unlimited access to all courses for just $25/month.

Become a member
Sometimes @lynda teaches me how to use a program and sometimes Lynda.com changes my life forever. @JosefShutter
@lynda lynda.com is an absolute life saver when it comes to learning todays software. Definitely recommend it! #higherlearning @Michael_Caraway
@lynda The best thing online! Your database of courses is great! To the mark and very helpful. Thanks! @ru22more
Got to create something yesterday I never thought I could do. #thanks @lynda @Ngventurella
I really do love @lynda as a learning platform. Never stop learning and developing, it’s probably our greatest gift as a species! @soundslikedavid
@lynda just subscribed to lynda.com all I can say its brilliant join now trust me @ButchSamurai
@lynda is an awesome resource. The membership is priceless if you take advantage of it. @diabetic_techie
One of the best decision I made this year. Buy a 1yr subscription to @lynda @cybercaptive
guys lynda.com (@lynda) is the best. So far I’ve learned Java, principles of OO programming, and now learning about MS project @lucasmitchell
Signed back up to @lynda dot com. I’ve missed it!! Proper geeking out right now! #timetolearn #geek @JayGodbold
Share a link to this course

What are exercise files?

Exercise files are the same files the author uses in the course. Save time by downloading the author's files instead of setting up your own files, and learn by following along with the instructor.

Can I take this course without the exercise files?

Yes! If you decide you would like the exercise files later, you can upgrade to a premium account any time.

Become a member Download sample files See plans and pricing

Please wait... please wait ...
Upgrade to get access to exercise files.

Exercise files video

How to use exercise files.

Learn by watching, listening, and doing, Exercise files are the same files the author uses in the course, so you can download them and follow along Premium memberships include access to all exercise files in the library.


Exercise files

Exercise files video

How to use exercise files.

For additional information on downloading and using exercise files, watch our instructional video or read the instructions in the FAQ .

This course includes free exercise files, so you can practice while you watch the course. To access all the exercise files in our library, become a Premium Member.

Join now Already a member? Log in

Are you sure you want to mark all the videos in this course as unwatched?

This will not affect your course history, your reports, or your certificates of completion for this course.


Mark all as unwatched Cancel

Congratulations

You have completed CINEMA 4D Essentials 4: Materials, Texturing, and Lights.

Return to your organization's learning portal to continue training, or close this page.


OK
Become a member to add this course to a playlist

Join today and get unlimited access to the entire library of video courses—and create as many playlists as you like.

Get started

Already a member ?

Become a member to like this course.

Join today and get unlimited access to the entire library of video courses.

Get started

Already a member?

Exercise files

Learn by watching, listening, and doing! Exercise files are the same files the author uses in the course, so you can download them and follow along. Exercise files are available with all Premium memberships. Learn more

Get started

Already a Premium member?

Exercise files video

How to use exercise files.

Ask a question

Thanks for contacting us.
You’ll hear from our Customer Service team within 24 hours.

Please enter the text shown below:

The classic layout automatically defaults to the latest Flash Player.

To choose a different player, hold the cursor over your name at the top right of any lynda.com page and choose Site preferences from the dropdown menu.

Continue to classic layout Stay on new layout
Exercise files

Access exercise files from a button right under the course name.

Mark videos as unwatched

Remove icons showing you already watched videos if you want to start over.

Control your viewing experience

Make the video wide, narrow, full-screen, or pop the player out of the page into its own window.

Interactive transcripts

Click on text in the transcript to jump to that spot in the video. As the video plays, the relevant spot in the transcript will be highlighted.

Learn more, save more. Upgrade today!

Get our Annual Premium Membership at our best savings yet.

Upgrade to our Annual Premium Membership today and get even more value from your lynda.com subscription:

“In a way, I feel like you are rooting for me. Like you are really invested in my experience, and want me to get as much out of these courses as possible this is the best place to start on your journey to learning new material.”— Nadine H.

Thanks for signing up.

We’ll send you a confirmation email shortly.


Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

Keep up with news, tips, and latest courses with emails from lynda.com.

Sign up and receive emails about lynda.com and our online training library:

Here’s our privacy policy with more details about how we handle your information.

   
submit Lightbox submit clicked
Terms and conditions of use

We've updated our terms and conditions (now called terms of service).Go
Review and accept our updated terms of service.