Physics MDPI’s Post

So it turns out that nowadays, you can do basic ray-optics simulations for free in the browser. Basically, like #Falstad circuit simulator, but for ray optics. Play around with it here: https://lnkd.in/dwzNE-JW Stuff I just tried with a basic camera/microscope setup (two lenses and aperture): - top: imaging a plane with @ ¼ magnification - mid: imaging three coloured point-sources @ ¼ magnification - bot: perspective/defocus/bokeh effect @ ½ magification — objects in-focus / out-of-focus #physics #optics #microscopy #photography #simulation cc: Max Simmonds, I imagine you'll have fun with this.

A high-resolution map of the Milky Way in 3D - Read more at:

Check out this fun collision system project from UE4Arch 🌱 What uses do you imagine for this? Adding value with XR (VR/AR), AI, visuals & marketing ¿Qué usos imaginas para esto?

Banger Machine by Castion; a laser banding time code completed in the #LightingLab March of 2021. After having it hidden away on a hard drive for 21 months, it is now live and viewable on our YouTube channel; https://lnkd.in/gvjBrzzQ. Interested in the science behind what you’re seeing (in the video)? Laser banding involves the manipulation of the exposure triangle of a camera while altering specific attributes of the laser projector. The results cannot be seen with the naked eye, as in, you cannot see it while standing in the room with the lasers. You have to view the lasers through the camera while in a video format. This still photo cannot provide a look at what was created. To really understand, you have to go watch the video. Trust us when we say, you won’t be disappointed. #LaserBanding #Science #Physics

Why thermal images are blurry: https://ow.ly/Wv3650S2uPS This Spotlight Summary of an Optics Express [#OPG_OpEx] study covers how image processing fails to recover geometric textures when the direct emission is spatially non-uniform. The study goes on to demonstrate a thermal simulator for 3D real-world scenes with non-uniform temperature distribution, showing that thermal physics-driven perception algorithms can correctly recover the geometric textures of realistic scenes with non-uniform temperatures. Spotlight Summary by Stefano Sfarra #3D #imaging #scienceandtechnology #physics

⚡Color Coding Vortices – Flapping Wing Propulsion 🎨 While airplanes rely on the steady motion of a wing to generate aerodynamic forces, animals use more intricate motions to propel themselves through fluids, both during swimming and flying. 👇 The flapping motions cause the surrounding air or water to swirl around the edges of the wing or fin, and the manipulation of these vortices is important for the forces generated. Of course, the flows around bird wings and fish fins are usually invisible to us, so we mimicked these types of motions in the laboratory and devised a way to fluorescently color code the water flows created by a 3D-printed wing. The results from these experiments are shown in these videos, where one sees a beautiful dance between the red vortices generated at the front and the green ones generated at the back. 🌎 Source: https://lnkd.in/etnyXbUm #engineeredmind #science #technology #engineering #mechanicalengineering #physics #mathematics

I have fond memories of heightmaps in POVray, where they were a cheap way of simulating very complex geometry. Yes, Unity has a parallel capability, and yes, you can do physics simulations on them. #unity #UnityPhysics #TerrainCollider

This closed space-filling curve, which belongs to the root-5 square grid family, is created with axiom “A++A”. This means that a curve (A) with loose ends is generated, the drawing direction is rotated 2 x 90 = 180 degrees and then another same curve is generated. The beauty of mathematics ensures that there are no gaps or overlaps between the curves. #mcescher #escherart #escher #mathart #digitalart #space #curve #path #fractal #Tissellator

Delving into the fascinating world of #Cymatics using the precision of a Cymascope and Canon EOS 5D This image captures the intriguing alignment of water particles responding to sound frequencies. When sound waves pass through water, they create vibrations that influence the arrangement of water molecules. The result? Symmetrical patterns emerge as the particles align in response to the frequency. It’s a simple yet captivating display of science in action. The organized pathways formed by the aligned water particles serve as a visual representation of the energy carried by the sound waves. Exploring the relationship between sound and water opens up a world of possibilities for understanding how vibrations can shape our surroundings. This image is from our on going research project with the @nadayogafoundation supported by the Alembic Group #Cymatics #SoundScience #WaterVibrations”

#3DMath #Quaternions If you are in Graphics/Animation/Robotics, you must have come across Quaternions at some point. They are the one thing that is used to get rotations right without any Gimbal Lock(from Euler Angles). For the longest time, I was confused about them and I imagine a lot of people would be as well so here is an exhaustive list of all resources that are freely available. If you go through them chronologically, you will have most of your doubts cleared. 1. 3Blue1Brown video(https://lnkd.in/g7r3xy5T) along with an interactive demo at eater.net/quaternions. Watch the video and play with the demo to get some kind of intuition. I bet you are more confused than before after watching this. Don't worry, there's more. I watched this multiple times over the years to get some kind of intuition of how quaternions work. The next one will hopefully save you that time. 2. Watch this: https://lnkd.in/g6K34dXs A Banger of a video. Hopefully, everything will come into place here. 3. Read the chapter on Quaternions in this fantastic book which is I believe is the best one for 3D Math available for free(?!). There are exercises with solutions here too. You can do them to get some practice. https://lnkd.in/g5q7bbA4 4. Now, if you are still sane and want to go deeper into the topic esp if you are interested in robotics/physics, you can take a look at this. A lot of things are discussed here which I didn't see anywhere else, particularly the part where the author goes through deriving the time derivative of a quaternion. https://lnkd.in/gJZhPuEd Warning: Heavy Math Notation 5. There is another branch of Algebra in Maths called Geometric Algebra - Grassman and Clifford which have an entirely new way of seeing vector products. One of the topics discussed are something called Rotors. They are a much more sane way of thinking about rotations without going into a 4D Hypersphere space which quaternions require. They are discussed here: https://lnkd.in/g2-wfX2S 6. And last but not the least - this right here -> https://lnkd.in/dhJhmgEm