How to Show Inside a Tube in Blender (+ Flowing Particles)

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 → https://www.patreon.com/Xan3D 🛠️ Xan 3D Tools Addon → https://xan3d.gumroad.com/l/Xan3DTools ☕ Donate https://ko-fi.com/Xan3D    • Blender Tutorials by Xan 3D      • Geometry Nodes Tutorials by Xan 3D      • Simulations Nodes Tutorials by Xan 3D   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