# Latest

**URL:** https://discourse.processing.org/latest.md?no_subcategories=false&page=322

[Latest](https://discourse.processing.org/latest.md) · [Categories](https://discourse.processing.org/categories.md) · [Tags](https://discourse.processing.org/tags.md)

**Page:** 323

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## [Use of inches in the Canvas](https://discourse.processing.org/t/use-of-inches-in-the-canvas/22733)

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**Author:** [@edduda1](https://discourse.processing.org/u/edduda1)\
**Replies:** 2\
**Last updated:** [July 20, 2020, 10:30am UTC](https://discourse.processing.org/t/use-of-inches-in-the-canvas/22733 "2020-07-20T10:30:46Z")

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Hello, I working on a project to simulate an arm swinging (ex. pendulum) but want to se the actual dimensions of an arm. For example 27 inches in length. How can I actually get the length when the canvas is in pixels? …

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## [I need Help with seekbar](https://discourse.processing.org/t/i-need-help-with-seekbar/22610)

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**Author:** [@MonteliaRO](https://discourse.processing.org/u/MonteliaRO)\
**Replies:** 2\
**Last updated:** [July 19, 2020, 11:17pm UTC](https://discourse.processing.org/t/i-need-help-with-seekbar/22610 "2020-07-19T23:17:00Z")

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Hello, I have a question. I wanted to know if I could make another window in the pop-up menu ("⋮") and because the text size can be set with a seekbar (slider) can someone help me? Like this (https://github.com/Emmanue…

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## [Diagonal line - gap](https://discourse.processing.org/t/diagonal-line-gap/22724)

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**Author:** [@Niprro](https://discourse.processing.org/u/Niprro)\
**Replies:** 4\
**Last updated:** [July 19, 2020, 3:24pm UTC](https://discourse.processing.org/t/diagonal-line-gap/22724 "2020-07-19T15:24:05Z")

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Trying to make a diagonal line from 0,0 to 600,600 Please help me understand why is there a gap at the end of my line. Why is the line ending before the last bottom right point on the canvas ? void setup () { size (6…

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## [3D room map by TFmini Lidar](https://discourse.processing.org/t/3d-room-map-by-tfmini-lidar/22709)

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**Author:** [@eladsoll](https://discourse.processing.org/u/eladsoll)\
**Replies:** 6\
**Last updated:** [July 19, 2020, 2:26pm UTC](https://discourse.processing.org/t/3d-room-map-by-tfmini-lidar/22709 "2020-07-19T14:26:11Z")

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Hi, I’m a beginner so I hope this time I worte as should. I’m trying to simulate room with TFmini lidar by using arduino Mega with serial port communication. The simulation is not good at all. I need help. My Arduino…

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## [TFmini lidar simulation](https://discourse.processing.org/t/tfmini-lidar-simulation/22608)

<div class="topic-metadata">

**Author:** [@eladsoll](https://discourse.processing.org/u/eladsoll)\
**Replies:** 2\
**Last updated:** [July 19, 2020, 11:45am UTC](https://discourse.processing.org/t/tfmini-lidar-simulation/22608 "2020-07-19T11:45:50Z")

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Hi, I’m a begginer and I’m tring to create a room simulation with my TFmini Lidar, the device works with serial communication. I diffeculties with my code, I’m trying to read from arduino and plot 3D as is. \</\> import…

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## [3D simulation by TFmini lidar](https://discourse.processing.org/t/3d-simulation-by-tfmini-lidar/22708)

<div class="topic-metadata">

**Author:** [@eladsoll](https://discourse.processing.org/u/eladsoll)\
**Replies:** 2\
**Last updated:** [July 19, 2020, 11:38am UTC](https://discourse.processing.org/t/3d-simulation-by-tfmini-lidar/22708 "2020-07-19T11:38:52Z")

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Hi, I’m a beginner , I’m trying to simulate 3D room map by TFmini LIDAR. I connected the sensor to arduino mega 2560 to communication pins. Moreover, I control 2 servo’s inorder to scan the room. This is my arduino cod…

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## [Each argument is accessed by a MIDI controller. Camera eyeX,Y,Z control](https://discourse.processing.org/t/each-argument-is-accessed-by-a-midi-controller-camera-eyex-y-z-control/22716)

<div class="topic-metadata">

**Author:** [@sq20](https://discourse.processing.org/u/sq20)\
**Replies:** 1\
**Last updated:** [July 19, 2020, 9:48am UTC](https://discourse.processing.org/t/each-argument-is-accessed-by-a-midi-controller-camera-eyex-y-z-control/22716 "2020-07-19T09:48:39Z")

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I’m trying to control the camera view using a MIDI controller. For each knob, we want to control it by attaching it to X, Y, and Z. But when I do X,Y,Z control in my code, when I touch the X knob, other knobs such as Y…

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## [Calling WebGL functions from p5.js](https://discourse.processing.org/t/calling-webgl-functions-from-p5-js/22714)

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**Author:** [@CND](https://discourse.processing.org/u/CND)\
**Replies:** 1\
**Last updated:** [July 19, 2020, 4:04am UTC](https://discourse.processing.org/t/calling-webgl-functions-from-p5-js/22714 "2020-07-19T04:04:39Z")

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## [Webcam is not working on my mac pro](https://discourse.processing.org/t/webcam-is-not-working-on-my-mac-pro/22705)

<div class="topic-metadata">

**Author:** [@yejincolor](https://discourse.processing.org/u/yejincolor)\
**Replies:** 2\
**Last updated:** [July 19, 2020, 12:52am UTC](https://discourse.processing.org/t/webcam-is-not-working-on-my-mac-pro/22705 "2020-07-19T00:52:53Z")

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In p5js editor, I wanted to test the example called “capture” to turn on my webcam on my mac pro. The code must be correct since I used the example that already existed, but the camera is not turning on and I do not know…

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## [Is it possible to draw main graphics on a PGraphics?](https://discourse.processing.org/t/is-it-possible-to-draw-main-graphics-on-a-pgraphics/10055)

<div class="topic-metadata">

**Author:** [@clankill3r](https://discourse.processing.org/u/clankill3r)\
**Replies:** 13\
**Last updated:** [July 18, 2020, 8:55pm UTC](https://discourse.processing.org/t/is-it-possible-to-draw-main-graphics-on-a-pgraphics/10055 "2020-07-18T20:55:46Z")

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Is it possible to draw g on a PGraphics? It should be done in P3D and it should be done without using loadPixels(); So something like this: PGraphics pg; void setup() { size(512, 512, P3D); pg = createGraphi…

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## [Is Processing 4 more performant than Processing 3.x in graphics?](https://discourse.processing.org/t/is-processing-4-more-performant-than-processing-3-x-in-graphics/21307)

<div class="topic-metadata">

**Author:** [@erkosone](https://discourse.processing.org/u/erkosone)\
**Replies:** 2\
**Last updated:** [July 18, 2020, 8:48pm UTC](https://discourse.processing.org/t/is-processing-4-more-performant-than-processing-3-x-in-graphics/21307 "2020-07-18T20:48:08Z")

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Hi comunity! I have a question… Is processing 4 significatively more performant than processign 3.x in P2D and P3D render modes?

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## [Desperate for Help, due in 2 days! Beginner & Confused, Rotating STRING text](https://discourse.processing.org/t/desperate-for-help-due-in-2-days-beginner-confused-rotating-string-text/22692)

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**Author:** [@Sugar](https://discourse.processing.org/u/Sugar)\
**Replies:** 7\
**Last updated:** [July 18, 2020, 7:56pm UTC](https://discourse.processing.org/t/desperate-for-help-due-in-2-days-beginner-confused-rotating-string-text/22692 "2020-07-18T19:56:28Z")

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Hi there, I am an Intern to an artist, and I have 0 experience coding, and frankly, I’m hating every second of it. But I have been tasked for Monday (July 20th 2020) to create a code for the show where the words “Press”…

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## [Quaternions and Euler Rotations Exploration](https://discourse.processing.org/t/quaternions-and-euler-rotations-exploration/11262)

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**Author:** [@glv](https://discourse.processing.org/u/glv)\
**Replies:** 1\
**Last updated:** [July 17, 2020, 5:55am UTC](https://discourse.processing.org/t/quaternions-and-euler-rotations-exploration/11262 "2020-07-17T05:55:30Z")

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Hello, I did an exploration of rotations with quaternions and Euler angles and sharing the “bare bones” code I wrote. The original project (a year ago) got out of hand and I really need to clean up the code and referen…

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## [Hour of code using type-in programs](https://discourse.processing.org/t/hour-of-code-using-type-in-programs/22700)

<div class="topic-metadata">

**Author:** [@codeguppy](https://discourse.processing.org/u/codeguppy)\
**Replies:** 0\
**Last updated:** [July 18, 2020, 1:22am UTC](https://discourse.processing.org/t/hour-of-code-using-type-in-programs/22700 "2020-07-18T01:22:12Z")

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In this post I’m challenging the common misconception that only block-based languages are appropriate for young coders… and I will present a new method heavily influenced by the golden age of home computers. This method …

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## [Calling updatePixels() from a separate thread doesn't update the main window](https://discourse.processing.org/t/calling-updatepixels-from-a-separate-thread-doesnt-update-the-main-window/22696)

<div class="topic-metadata">

**Author:** [@Underslash](https://discourse.processing.org/u/Underslash)\
**Replies:** 2\
**Last updated:** [July 18, 2020, 1:10am UTC](https://discourse.processing.org/t/calling-updatepixels-from-a-separate-thread-doesnt-update-the-main-window/22696 "2020-07-18T01:10:37Z")

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Exactly what the title says, when I run updatePixels() from a function thats running in a thread, it doesn’t update the pixels, but calling updatePixels() from the function which I ran the thread from updates it. Example…

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## [Which Processing API?](https://discourse.processing.org/t/which-processing-api/22698)

<div class="topic-metadata">

**Author:** [@codeguppy](https://discourse.processing.org/u/codeguppy)\
**Replies:** 0\
**Last updated:** [July 18, 2020, 12:59am UTC](https://discourse.processing.org/t/which-processing-api/22698 "2020-07-18T00:59:32Z")

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Dear teachers, I assume you’re all using processing API in your classroom / coding club. I’d like to ask you: which processing library or environment are you using? Are you using bare bone p5.js sketches, processing Ja…

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## [Same program - Two Implementations ❤](https://discourse.processing.org/t/same-program-two-implementations/22697)

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**Author:** [@codeguppy](https://discourse.processing.org/u/codeguppy)\
**Replies:** 0\
**Last updated:** [July 18, 2020, 12:54am UTC](https://discourse.processing.org/t/same-program-two-implementations/22697 "2020-07-18T00:54:23Z")

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Hello friends, This article documents an experiment that I made to implement the same program on two different coding platforms for beginners: codeguppy.com Khan Academy What eased the porting between the platform is…

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## [Could not run the sketch (Target VM failed to initialize). Kinect V2](https://discourse.processing.org/t/could-not-run-the-sketch-target-vm-failed-to-initialize-kinect-v2/22687)

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**Author:** [@HugoD](https://discourse.processing.org/u/HugoD)\
**Replies:** 0\
**Last updated:** [July 17, 2020, 2:20pm UTC](https://discourse.processing.org/t/could-not-run-the-sketch-target-vm-failed-to-initialize-kinect-v2/22687 "2020-07-17T14:20:30Z")

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Hi, I’m getting this error when I run the examples from the OpenCV\_Processing library with a kinect V2. “Could not run the sketch (Target VM failed to initialize).” I’m using Windows 10 Pro 64-bit Intel® Core™ i7-975…

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## [Draggable Images Triggering and Processing Sound](https://discourse.processing.org/t/draggable-images-triggering-and-processing-sound/22667)

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**Author:** [@briangriffith](https://discourse.processing.org/u/briangriffith)\
**Replies:** 5\
**Last updated:** [July 17, 2020, 8:30pm UTC](https://discourse.processing.org/t/draggable-images-triggering-and-processing-sound/22667 "2020-07-17T20:30:52Z")

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I am trying to figure out a way to do a fairly simple idea: I have two PNGs which are draggable across the canvas and I want each of them to trigger a loop. Beyond that, I want the position of the image to dictate the pa…

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## [Pyramid Rect Pattern](https://discourse.processing.org/t/pyramid-rect-pattern/22689)

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**Author:** [@chemicalite](https://discourse.processing.org/u/chemicalite)\
**Replies:** 7\
**Last updated:** [July 17, 2020, 8:15pm UTC](https://discourse.processing.org/t/pyramid-rect-pattern/22689 "2020-07-17T20:15:22Z")

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Hello! I’m making a pyramid pattern with rects using for loops. It’s a bit hard to explain, but basically, I would like to divide a square canvas into four triangular quadrants and fill each side with pyramids made from…

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## [Download file from FTP server?](https://discourse.processing.org/t/download-file-from-ftp-server/22651)

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**Author:** [@jetjaguar](https://discourse.processing.org/u/jetjaguar)\
**Replies:** 3\
**Last updated:** [July 17, 2020, 5:03pm UTC](https://discourse.processing.org/t/download-file-from-ftp-server/22651 "2020-07-17T17:03:05Z")

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I feel like I’m missing something simple here. I just want to download and then display an image file from a remote, public FTP server. When I try to do so I get “The file xxx is missing or inaccessible, make sure the U…

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## [Tint image with alpha transparency in WEBGL](https://discourse.processing.org/t/tint-image-with-alpha-transparency-in-webgl/22002)

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**Author:** [@dfd0226](https://discourse.processing.org/u/dfd0226)\
**Replies:** 2\
**Last updated:** [July 17, 2020, 4:52pm UTC](https://discourse.processing.org/t/tint-image-with-alpha-transparency-in-webgl/22002 "2020-07-17T16:52:43Z")

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Hi all! Background I’m trying to figure out how to set the alpha channel on an image using tint when the sketch is in WEBGL mode. I’m building a React app that integrates p5.js. My code uses a physics library to create…

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## [Object Property Implementation](https://discourse.processing.org/t/object-property-implementation/22628)

<div class="topic-metadata">

**Author:** [@VegasBob](https://discourse.processing.org/u/VegasBob)\
**Replies:** 18\
**Last updated:** [July 17, 2020, 3:43pm UTC](https://discourse.processing.org/t/object-property-implementation/22628 "2020-07-17T15:43:51Z")

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Just getting started with Java using the Processing IDE, and I can’t seem to find a way to properly code my Classes to produce properties that will behave like genuine properties - meaning that I can use: Employee.Name …

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## [Imported SVG is PShape GROUP, cannot convert to ArrayList of PVector](https://discourse.processing.org/t/imported-svg-is-pshape-group-cannot-convert-to-arraylist-of-pvector/22642)

<div class="topic-metadata">

**Author:** [@loremipsum](https://discourse.processing.org/u/loremipsum)\
**Replies:** 2\
**Last updated:** [July 17, 2020, 2:06pm UTC](https://discourse.processing.org/t/imported-svg-is-pshape-group-cannot-convert-to-arraylist-of-pvector/22642 "2020-07-17T14:06:38Z")

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I’ve been trying to read in a .svg i made in Illustrator. It imports/displays properly as a PShape, but I’m hoping to convert the shape into an ArrayList of PVectors so I can manipulate the shape. Here’s what I’ve done: …

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## [Used p5py to show how a laser works](https://discourse.processing.org/t/used-p5py-to-show-how-a-laser-works/22497)

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**Author:** [@renec112](https://discourse.processing.org/u/renec112)\
**Replies:** 8\
**Last updated:** [July 17, 2020, 7:28am UTC](https://discourse.processing.org/t/used-p5py-to-show-how-a-laser-works/22497 "2020-07-17T07:28:01Z")

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I used the p5py package to explain and simulate how a laser obtains population inversion. Article is here on medium.

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## [Did macOS Catalina (or something) break the Video library?](https://discourse.processing.org/t/did-macos-catalina-or-something-break-the-video-library/14699)

<div class="topic-metadata">

**Author:** [@E\_R](https://discourse.processing.org/u/E_R)\
**Replies:** 23\
**Last updated:** [July 17, 2020, 4:02am UTC](https://discourse.processing.org/t/did-macos-catalina-or-something-break-the-video-library/14699 "2020-07-17T04:02:33Z")

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Hi, I am currently unable to run any code using processing.video's Capture object- including the basic Example sketches. It seems that instantiating the Capture object is where the crash occurs, and it happens regardle…

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## [Designing the input](https://discourse.processing.org/t/designing-the-input/22451)

<div class="topic-metadata">

**Author:** [@ARNAV\_A\_GUPTA](https://discourse.processing.org/u/ARNAV_A_GUPTA)\
**Replies:** 6\
**Last updated:** [July 17, 2020, 12:00am UTC](https://discourse.processing.org/t/designing-the-input/22451 "2020-07-17T00:00:56Z")

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i want to create an input whose width and increases with respect to how much you’ve written and to create another line… Can I do something like this??? I know I can do it for length… just by checking the input.value() …

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## [Cull or Remove polygon backfaces with OpenGL](https://discourse.processing.org/t/cull-or-remove-polygon-backfaces-with-opengl/22673)

<div class="topic-metadata">

**Author:** [@CND](https://discourse.processing.org/u/CND)\
**Replies:** 0\
**Last updated:** [July 16, 2020, 10:00pm UTC](https://discourse.processing.org/t/cull-or-remove-polygon-backfaces-with-opengl/22673 "2020-07-16T22:00:29Z")

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OpenGL has a command to cull backfaces “glCullFace”. I would like to know how to execute this. I want to view semi-wireframe images only showing framed front faces. This is a larger question on how to execute other Ope…

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## [Lerp() not working as expected in animation between array position values](https://discourse.processing.org/t/lerp-not-working-as-expected-in-animation-between-array-position-values/22670)

<div class="topic-metadata">

**Author:** [@fpalla](https://discourse.processing.org/u/fpalla)\
**Replies:** 5\
**Last updated:** [July 16, 2020, 9:43pm UTC](https://discourse.processing.org/t/lerp-not-working-as-expected-in-animation-between-array-position-values/22670 "2020-07-16T21:43:47Z")

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Hello forum/guys/people who understand js better than me, feels like kind of a noob question but I don’t think my knowledge at this point is sufficeint to figure out on my own. Either this or I’m blind to something. Rea…

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## [Change background in order/ using values in array](https://discourse.processing.org/t/change-background-in-order-using-values-in-array/22665)

<div class="topic-metadata">

**Author:** [@anderbaer](https://discourse.processing.org/u/anderbaer)\
**Replies:** 5\
**Last updated:** [July 16, 2020, 8:29pm UTC](https://discourse.processing.org/t/change-background-in-order-using-values-in-array/22665 "2020-07-16T20:29:35Z")

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int i = 0; int\[\] array = {250, 150, 100, 50, 0}; void setup() { size(500, 500); } void draw() { for (int i = 0; i \< array.length; i++) { if (array\[i\] == 0) { println(array); background(array\[i…

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