I do have lighting by way of an HDRI, plugged into the world lighting settings. You can’t see this though as I’ve set the Background to Transparent so the HDRI doesn’t render in my final image. There are plenty of tutorials on how to set up an HDRI. I’ve also explained it in passing in a number of other videos. Try watching my nanoparticle video for eg.

3:57-4:01, we are not doing anything with the R vector. (The R vector is given by the output of the vector subtract operation in the R vector frame). What is happening here is, I am just using the Geometry Proximity (which I use to compute the R vector) to also find the nearest normal vector.

Glad you liked it! Hope you find the other videos useful!

Thank you!

@@ryomizutagraphics is the backdrop used available anywhere or should i try to construct it myself, many thanks

@@jaechulju836 what component do you need to change the colour for?

You're going to need to give me a bit more information about what you're trying to create for me to help.

That's a good question. So at the moment, best bet is to just draw it all as one curve. I was also trying to play with ways of building individual components and then snapping them together with geometry nodes. I'm pretty sure this is a nifty way, but I haven't made much headway since posting this video...

@@ryomizutagraphics aha yeah thats the approach I am trying to do right now, maybe i'll report back if I come up with some neat way to do it Thanks!

Glad you like them!

Check out my other video - how to make any object porous

@@ryomizutagraphics thank you man

Good questions. The mesh to volume node can’t be used because it doesn’t accept a Field value as input for its density. You need this because the ability for the noise texture to drive spatial variations in density is captured as a Field.

Thats because you are using the Eevee render engine, whereas I am using Cycles. The diamond shapes are from using Points as the Instance Object - Cycles can process these into spheres but Eevee cannot. If you want to use Eevee, plug in either a UV sphere or Icosphere as your Instance Object

There are many ways to do this. Just off the top of my head, you could animate the Start value of the Trim Curve node, rather than the End value. Connect the Floored Modulo to the Start input rather than the End. You'll need to flip the output from the Modulo (it current goes from 0 -> 1 as the frame count progresses. We want it to go 1 -> 0 instead). Drop a Map Range between Floored Modulo and Trim Curve. Set the to min/max to 1 and 0. Hit play, the print should appear from the other end

@@ryomizutagraphics Thank you, that worked great!

When you say "shader editor", do you mean the materials tab on the right (like I used), or actually dragging open a new window and turning it into shader editor? If your materials tab gives a black canvas, I'm confused. If you actually mean the shader editor, you have to first click New at the top create a new material. This should automatically pop up a Principled bsdf and shader output node.

@@ryomizutagraphics thanks. I tried a new file and bsdf pops up.

Glad it helped!

In other words, to see the light beam after a few reflections, I need to draw the beam manually, it is not simulated by the assets?

@@brains1473 Correct. This is just to expedite the process for anyone wanting to create 3D illustrations for setups. That said, I'm fairly certain that simple ray optics calculations can be set up with geometry nodes (if you know what you are doing). E.g. see this old post by Thomas Hartman (aka This Illustrations on X): x.com/Illustrate_THIS/status/1626527055855624193

@@ryomizutagraphics Thank you for the link, very interesting.

Make sure you’re using Cycles, not Eevee

I don't know where i have choose this cycle engine

I am not pro in blender i am using first time ...

Under Render Settings

Thankyou very much......also can you tell me ...that how i can export this figure in PPT ...i am exporting in .glt form but it is not coming exactly like this.....please suggest me how can i export this

I run everything with the Cycles engine. If you are using Eevee (which Blender does by default), you'll need to: 1) Under render settings, activate refractions (in the “screen space reflections” section) 2) Under material settings, activate “screen space refraction” and set the blend mode to Alpha hashed N.B. Glass materials in Eevee generally don't look as good as in Cycles, which properly path-traces the light bounces

Check out my other tutorial - How to turn anything porous

See my reply to the pinned comment :)

Many thanks @@ryomizutagraphics!

Glad it was helpful!

Sounds like you might have forgotten to apply scale to your coin

@@ryomizutagraphics Thanks for the quick response! I have applied scale to my object, it doesn't make a difference. The particles are still narrow. When I scale the width of my coin object the particles become 'equal' in dimensions (sphere/cube), which is what I want! So how could I change the particles without changing the shape of the coin? Can I apply a certrain node for this?

Ok, in which case, add a Position node, connect it to a Vector Math node, and connect that into the input Vector socket of whatever texture you’re using to create the porosity. Set the Vector Math to multiply and set the multiply values so as to stretch/compress your position coordinates as needed to fix your scaling

@@ryomizutagraphics This does affect the width of the particles in a certain way, but more like a 'stretch'. It extrudes them kinda, rather than turning the particles into a sphere/cube as it does with object scaling. Could this have to do with the Volume Cube? Like I said before when I scale the width of my coin object the particles become spherical. And when I scale them even further beyond that they stretch out. It looks like the sweet spot for the particles is when my object has a 'cube like' dimension.

Might be faster if I check your blend file. Do you want to just email me what you have + a sketch of what exactly you want to get? My email is [email protected]

Agreed! If there is a way to convert .ovf to .csv, you’d be in business. I’m not an expert but a quick glance online suggests this might be possible? If you can read the data in, you can use geometry nodes to do all sorts to visualise it (eg there’s some great tutorials by CGFigures on data manipulation from csv)

@@ryomizutagraphics I am aware of the .csv route from CGFigures, yes. If .csv is the most useful, then I will have to do that. (Initially, I have used Atomic Blender for stuff like this, but it only uses .xyz and .pdb unfortunately).

​@@ryomizutagraphics In that case, I'm going to have to try the CSV route :D I'm familiar with CGFigures CSV stuff. (Typically, I use Atomic Blender for this kind of stuff, but unfortunately it only uses XYZ and PDB data).

Yep! Planning for one is in the works :)

This is great. So simple. Would take ages with other tools.

I have a separate tutorial for porous geometries with any geometry on my channel. However, cylinders do seem to have issues with that technique. Try modifying this setup as follows. Add a position node, connect a separate xyz. Connect out only x,y components to combine xyz to make an xy only vector. Add vector math (length) to it, then compare node set to less than. Add a math node set to multiply before the map range node, and multiply the output from the colour ramp with the compare node from above. Toggle the "less than" threshold value in the compare node to get thinner/fatter cylinders

Glad you loved it!

Glad you like them!

Gee, I dunno if I can be goat-ed yet but I appreciate the support!

Add a set material node right at the end, make your material and select it there

@@ryomizutagraphics Thank you for ur response

Glad you like it!

Pleasure 🙇🏻‍♂️

Oh dear! What geometry are you using?

Thanks!

Thanks for the sub!

I’m mot sure books are necessarily the best resource for this kind learning, 1) because there aren’t many around for scientific illustration in Blender, and 2) Blender itself updates so frequently (3 version updates per year). So any print material quickly goes out of date; this is especially true for geometry nodes content

My pleasure!