Uploaded February 2026 | Updated September 2026, 1 week ago
Learn the best way to show the inside of a tube in Blender using a simple Backfacing shader trick.
We compare three methods and explain why one works better from any angle.
Then we build a procedural particle flow inside the tube using Geometry Nodes with velocity control, looping, random movement, and full customization.
Perfect for explainer videos, science animations (like blood flowing through veins), technical visualizations, energy effects, or motion graphics.
👉 Download all my projects and watch exclusive tutorials on my Patreon → patreon.com/Xan3D
🛠️ Xan 3D Tools Addon → xan3d.gumroad.com/l/Xan3DTools
☕ Donate ko-fi.com/Xan3D
youtube.com/playlist?list=PL0AcuhCefph9F3NDbr-o9cvWUfMy5365A
youtube.com/playlist?list=PL0AcuhCefph_LNfrsd9xWkPZM__XN3YDd
youtube.com/playlist?list=PL0AcuhCefph-u9jmXkH1Q1bff8PuFwFJC
00:00 Intro
00:15 Option 1: Using an Arc
01:34 Option 2: Transparent Material
03:32 Option 3: Backfacing Material (Best Method)
05:37 Making an Object Follow a Curve
07:00 Animating More Points Along the Curve
08:30 Distributing Points by Distance
09:28 Adjusting Velocity
10:22 Random Point Distribution
12:58 Looping the Animation
13:47 Adding Random Movement
17:35 Randomizing Velocity
19:25 Replacing Points with Any Object
20:39 Creating Any Tube Shape with Particles
21:18 Adding Random Scale
#Blender #GeometryNodes
Learn the best way to show the inside of a tube in Blender using a simple Backfacing shader trick.
We compare three methods and explain why one works better from any angle.
Then we build a procedural particle flow inside the tube using Geometry Nodes with velocity control, looping, random movement, and full customization.
Perfect for explainer videos, science animations (like blood flowing through veins), technical visualizations, energy effects, or motion graphics.
👉 Download all my projects and watch exclusive tutorials on my Patreon → patreon.com/Xan3D
🛠️ Xan 3D Tools Addon → xan3d.gumroad.com/l/Xan3DTools
☕ Donate ko-fi.com/Xan3D
youtube.com/playlist?list=PL0AcuhCefph9F3NDbr-o9cvWUfMy5365A
youtube.com/playlist?list=PL0AcuhCefph_LNfrsd9xWkPZM__XN3YDd
youtube.com/playlist?list=PL0AcuhCefph-u9jmXkH1Q1bff8PuFwFJC
00:00 Intro
00:15 Option 1: Using an Arc
01:34 Option 2: Transparent Material
03:32 Option 3: Backfacing Material (Best Method)
05:37 Making an Object Follow a Curve
07:00 Animating More Points Along the Curve
08:30 Distributing Points by Distance
09:28 Adjusting Velocity
10:22 Random Point Distribution
12:58 Looping the Animation
13:47 Adding Random Movement
17:35 Randomizing Velocity
19:25 Replacing Points with Any Object
20:39 Creating Any Tube Shape with Particles
21:18 Adding Random Scale
#Blender #GeometryNodes
