# Processing

**URL:** https://discourse.processing.org/c/processing/6.md?no_subcategories=false&page=273

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

**Page:** 274

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## [Change or fix text Background in P3D](https://discourse.processing.org/t/change-or-fix-text-background-in-p3d/13903)

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**Author:** [@Waboqueox](https://discourse.processing.org/u/Waboqueox)\
**Replies:** 3\
**Last updated:** [September 10, 2019, 4:22pm UTC](https://discourse.processing.org/t/change-or-fix-text-background-in-p3d/13903 "2019-09-10T16:22:48Z")

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Hi people, have a new question: When using P3D the text is written with the original background of your sketch (or any color, don’t know from where it takes the color). I was trying to put a text but there appear a tex…

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## [How to make a bezier curver not start at top left corner when using mouseX, mouseY as the initial anchor point?](https://discourse.processing.org/t/how-to-make-a-bezier-curver-not-start-at-top-left-corner-when-using-mousex-mousey-as-the-initial-anchor-point/13912)

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**Author:** [@nathanchun](https://discourse.processing.org/u/nathanchun)\
**Replies:** 4\
**Last updated:** [September 10, 2019, 2:04pm UTC](https://discourse.processing.org/t/how-to-make-a-bezier-curver-not-start-at-top-left-corner-when-using-mousex-mousey-as-the-initial-anchor-point/13912 "2019-09-10T14:04:42Z")

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I am new to processing and was assigned in class to create a bezier curve that makes one of the control points mouseX and mouseY along with some other necessary shapes needed for the assignment. Whenever I hit run, howev…

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## [Clock, reset hour and new day statement](https://discourse.processing.org/t/clock-reset-hour-and-new-day-statement/13837)

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**Author:** [@vincentstrebelle](https://discourse.processing.org/u/vincentstrebelle)\
**Replies:** 6\
**Last updated:** [September 6, 2019, 7:27pm UTC](https://discourse.processing.org/t/clock-reset-hour-and-new-day-statement/13837 "2019-09-06T19:27:37Z")

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Hi, i made a very basic clock and i have two questions. 1: I wonder how can i reset the hours. Like when it past 24 it restart to 0. 2: How can i make a statement when a new day start. Can i use a boolean ? void setup…

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## [Quadtree vs grid](https://discourse.processing.org/t/quadtree-vs-grid/13844)

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**Author:** [@paulgoux](https://discourse.processing.org/u/paulgoux)\
**Replies:** 4\
**Last updated:** [September 10, 2019, 11:35am UTC](https://discourse.processing.org/t/quadtree-vs-grid/13844 "2019-09-10T11:35:45Z")

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Hi, after experimenting with processing it becomes increasingly clear that there is a need for some kind of space management when dealing with particles and their collisions. I’m currently partitioning the canvas using a…

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## [Display images alternately](https://discourse.processing.org/t/display-images-alternately/13567)

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**Author:** [@Moene](https://discourse.processing.org/u/Moene)\
**Replies:** 3\
**Last updated:** [August 24, 2019, 11:11am UTC](https://discourse.processing.org/t/display-images-alternately/13567 "2019-08-24T11:11:16Z")

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How can I display an image in draw() successively with a delay between them? PImage img1; PImage img2; void setup () { img1 = loadImage("step5.png"); img2 = loadImage("fail2.png"); size(801,583); background(…

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## [Shapes3D.pickShape and G4P P3D view combine?](https://discourse.processing.org/t/shapes3d-pickshape-and-g4p-p3d-view-combine/13849)

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**Author:** [@mala](https://discourse.processing.org/u/mala)\
**Replies:** 9\
**Last updated:** [September 10, 2019, 8:04am UTC](https://discourse.processing.org/t/shapes3d-pickshape-and-g4p-p3d-view-combine/13849 "2019-09-10T08:04:06Z")

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Can the pickshape function of Shapes3D be used with a 3D gview in G4P ? I can’t seem to make it work, I think possibly something is going wrong with a matrix transform somewhere between the gview and the pickbuffer … or…

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## [Vectors not adding?](https://discourse.processing.org/t/vectors-not-adding/13900)

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**Author:** [@blue1](https://discourse.processing.org/u/blue1)\
**Replies:** 2\
**Last updated:** [September 10, 2019, 7:21am UTC](https://discourse.processing.org/t/vectors-not-adding/13900 "2019-09-10T07:21:54Z")

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//I cant figure out how to get the isMoving function to work, im kind of comfortable with p5js and trying to learn processing but it seems there are always small bugs i cant find. Ground ground; Character character; PVe…

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## [Chain hierarchy](https://discourse.processing.org/t/chain-hierarchy/13845)

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**Author:** [@TimoL](https://discourse.processing.org/u/TimoL)\
**Replies:** 6\
**Last updated:** [September 9, 2019, 9:20pm UTC](https://discourse.processing.org/t/chain-hierarchy/13845 "2019-09-09T21:20:20Z")

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Here’s something I’ve been trying to figure out. Im trying to build a hierarchy of ellipses such that each child ellipse has to stay within a certain range of its parent. I understand how it needs to work, Im just not…

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## [Float Precision](https://discourse.processing.org/t/float-precision/13836)

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**Author:** [@grumo](https://discourse.processing.org/u/grumo)\
**Replies:** 15\
**Last updated:** [September 7, 2019, 4:10am UTC](https://discourse.processing.org/t/float-precision/13836 "2019-09-07T04:10:43Z")

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I’m using doubles for some mathematical calculations and I’m getting these two values: a = -69.49068165087722 n = 304.2372372266157 The problem is when I do this: float fa = (float) a; float fb = (float) b; I get: …

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## [Can't draw on main window, calling methods from a secondary window (PApplet, image())](https://discourse.processing.org/t/cant-draw-on-main-window-calling-methods-from-a-secondary-window-papplet-image/13889)

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**Author:** [@Pvag](https://discourse.processing.org/u/Pvag)\
**Replies:** 1\
**Last updated:** [September 9, 2019, 7:32am UTC](https://discourse.processing.org/t/cant-draw-on-main-window-calling-methods-from-a-secondary-window-papplet-image/13889 "2019-09-09T07:32:14Z")

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Hello ! From the main processing sketch file, I am instantiating objectA that defines methodA, which draws stuff on a PImage, that it then draws on the main window, using the image() function. This works as expected, wh…

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## [Issue With Making a House](https://discourse.processing.org/t/issue-with-making-a-house/13875)

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**Author:** [@Katerina\_P](https://discourse.processing.org/u/Katerina_P)\
**Replies:** 13\
**Last updated:** [September 9, 2019, 12:37am UTC](https://discourse.processing.org/t/issue-with-making-a-house/13875 "2019-09-09T00:37:01Z")

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Hi Guys, Im trying to make a house and my code isn’t running. Can someone please tell me why? This is the code: void setup() { size(200, 200); background(255); smooth(); } void draw () { fill(#1E4609); rect (0…

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## [Getting amplitude values from a SoundFile (processing.sound)](https://discourse.processing.org/t/getting-amplitude-values-from-a-soundfile-processing-sound/13877)

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**Author:** [@Brunehilde](https://discourse.processing.org/u/Brunehilde)\
**Replies:** 1\
**Last updated:** [September 8, 2019, 9:54pm UTC](https://discourse.processing.org/t/getting-amplitude-values-from-a-soundfile-processing-sound/13877 "2019-09-08T21:54:42Z")

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Hi ! I’ve been playing around with the Sound library for a bit to make a simple music visualizer, but I can’t seem to get the amp values for specific points in the music to make a nice timeline. Here’s how I defined al…

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## [Applying Class to each character in a string](https://discourse.processing.org/t/applying-class-to-each-character-in-a-string/13870)

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**Author:** [@tylerowens](https://discourse.processing.org/u/tylerowens)\
**Replies:** 7\
**Last updated:** [September 8, 2019, 10:13am UTC](https://discourse.processing.org/t/applying-class-to-each-character-in-a-string/13870 "2019-09-08T10:13:32Z")

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Hello all, I am going to try my best to describe what I am trying to make so I can hopefully receive some help. I am trying to make each character in a string accelerate towards the mouse. With the code I have currently…

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## [This code works in my friend's pc but I get error](https://discourse.processing.org/t/this-code-works-in-my-friends-pc-but-i-get-error/13859)

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**Author:** [@sp\_sarvesh](https://discourse.processing.org/u/sp_sarvesh)\
**Replies:** 7\
**Last updated:** [September 8, 2019, 12:34am UTC](https://discourse.processing.org/t/this-code-works-in-my-friends-pc-but-i-get-error/13859 "2019-09-08T00:34:00Z")

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I get ArrayOutOf BoundsException: 0 on line 12 when I run this code, and then java sm has stopped responding when I try to close the small window. Can anyone please help me with this? This same code works for my friend. …

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## [Dividing a round number doesn't work. Dividing as a variable does?](https://discourse.processing.org/t/dividing-a-round-number-doesnt-work-dividing-as-a-variable-does/13862)

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**Author:** [@Marinus](https://discourse.processing.org/u/Marinus)\
**Replies:** 6\
**Last updated:** [September 7, 2019, 7:06pm UTC](https://discourse.processing.org/t/dividing-a-round-number-doesnt-work-dividing-as-a-variable-does/13862 "2019-09-07T19:06:15Z")

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Hi, I am having a question why something doesn’t work one way, but it does the other way. I was sketching something out in processing with this variable: float k = 5 / 8; It didn’t want to work. But when I did it like…

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## [Piston effect in Processing simulation](https://discourse.processing.org/t/piston-effect-in-processing-simulation/13867)

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**Author:** [@harvious](https://discourse.processing.org/u/harvious)\
**Replies:** 1\
**Last updated:** [September 7, 2019, 2:38pm UTC](https://discourse.processing.org/t/piston-effect-in-processing-simulation/13867 "2019-09-07T14:38:17Z")

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0 I am trying to set up a simulation of a 2D box containing a number of particles (circles of radius r) colliding elastically with each other and the wall. I then tried to add in a piston (a line object with some stroke…

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## [Is there a way to make random grids/layouts in Processing?](https://discourse.processing.org/t/is-there-a-way-to-make-random-grids-layouts-in-processing/13854)

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**Author:** [@jb99](https://discourse.processing.org/u/jb99)\
**Replies:** 10\
**Last updated:** [September 7, 2019, 5:55pm UTC](https://discourse.processing.org/t/is-there-a-way-to-make-random-grids-layouts-in-processing/13854 "2019-09-07T17:55:37Z")

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Hi everyone, I’m a visual designer and I’m new to processing. I would like to know if there are any possibilities in Processing to create random aesthetic grids/layouts for editorial projects let’s say that are very sim…

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## [How to generate something like this (concrete choreography)?](https://discourse.processing.org/t/how-to-generate-something-like-this-concrete-choreography/13850)

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**Author:** [@Rohith\_DJ](https://discourse.processing.org/u/Rohith_DJ)\
**Replies:** 3\
**Last updated:** [September 6, 2019, 8:43pm UTC](https://discourse.processing.org/t/how-to-generate-something-like-this-concrete-choreography/13850 "2019-09-06T20:43:01Z")

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How do we generate something like this? What kind of systems (attractors, etc) or tools that could be used to generate these kind of forms?

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## [How to snap mouse to a shape/coordinate?](https://discourse.processing.org/t/how-to-snap-mouse-to-a-shape-coordinate/13414)

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**Author:** [@NadeW](https://discourse.processing.org/u/NadeW)\
**Replies:** 8\
**Last updated:** [August 18, 2019, 2:48pm UTC](https://discourse.processing.org/t/how-to-snap-mouse-to-a-shape-coordinate/13414 "2019-08-18T14:48:45Z")

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Hello my idea is to snap the mouse cursor to intersections on a grid when the user approaches them (this will center the mouse pointer to that cross on the grid). I did some digging but I haven’t found anything that can …

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## [Can any one tell me why do I get this error while quitting any P3D seketch](https://discourse.processing.org/t/can-any-one-tell-me-why-do-i-get-this-error-while-quitting-any-p3d-seketch/13800)

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**Author:** [@shoccho](https://discourse.processing.org/u/shoccho)\
**Replies:** 5\
**Last updated:** [September 6, 2019, 5:29pm UTC](https://discourse.processing.org/t/can-any-one-tell-me-why-do-i-get-this-error-while-quitting-any-p3d-seketch/13800 "2019-09-06T17:29:53Z")

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X11Util.Display: Shutdown (JVM shutdown: true, open (no close attempt): 2/2, reusable (open, marked uncloseable): 0, pending (open in creation order): 2) X11Util: Open X11 Display Connections: 2 X11Util: Open\[0\]: NamedX1…

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## [String is not null, but it behaves as if it were](https://discourse.processing.org/t/string-is-not-null-but-it-behaves-as-if-it-were/13840)

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**Author:** [@AngelRF](https://discourse.processing.org/u/AngelRF)\
**Replies:** 8\
**Last updated:** [September 6, 2019, 2:49pm UTC](https://discourse.processing.org/t/string-is-not-null-but-it-behaves-as-if-it-were/13840 "2019-09-06T14:49:39Z")

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Hi, i’m trying to read a ASCII object (.obj) file and i’m having troubles. In the file, there are some empty lines with only \\r\\n (CRLF) line breaks, for example, line 1 and 3 (the 1st line is 0). When I do things with…

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## [Allowing sketch to use OS window snap features](https://discourse.processing.org/t/allowing-sketch-to-use-os-window-snap-features/13829)

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**Author:** [@paulgoux](https://discourse.processing.org/u/paulgoux)\
**Replies:** 1\
**Last updated:** [September 6, 2019, 12:53pm UTC](https://discourse.processing.org/t/allowing-sketch-to-use-os-window-snap-features/13829 "2019-09-06T12:53:24Z")

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Not really too sure how to categorize this, but is there an easy way to allow the processing application to make use of Windows native snap/maximize feature, or can this be programmed using a simple mouse-pressed functio…

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## [Getting User input](https://discourse.processing.org/t/getting-user-input/1670)

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**Author:** [@ctrembla](https://discourse.processing.org/u/ctrembla)\
**Replies:** 16\
**Last updated:** [September 6, 2019, 12:46pm UTC](https://discourse.processing.org/t/getting-user-input/1670 "2019-09-06T12:46:42Z")

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Java Proccessing OK, I’ve watched several youtube shows of getting the user’s input. Even though I didn’t like the way they did it I tried it since I have no other idea of how to do it. So in the game I’m making my high…

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## [Exporting Point Cloud](https://discourse.processing.org/t/exporting-point-cloud/13797)

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**Author:** [@kud7](https://discourse.processing.org/u/kud7)\
**Replies:** 4\
**Last updated:** [September 6, 2019, 4:27am UTC](https://discourse.processing.org/t/exporting-point-cloud/13797 "2019-09-06T04:27:59Z")

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Hi, what’re my options to export Kinect point cloud data, alembic or obj format from Processing? The idea is to import point cloud data or sequence to Cinema 4D? Thanks!

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## [Transform shapes so part of wall appears to be decaying](https://discourse.processing.org/t/transform-shapes-so-part-of-wall-appears-to-be-decaying/13742)

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**Author:** [@helpMe](https://discourse.processing.org/u/helpMe)\
**Replies:** 8\
**Last updated:** [September 5, 2019, 9:16am UTC](https://discourse.processing.org/t/transform-shapes-so-part-of-wall-appears-to-be-decaying/13742 "2019-09-05T09:16:16Z")

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Hi, I’m working in a project. I did some code, but which is not done. I’m very new in processing. I don’t understand properly how everything works. I’ll share the project idea and code below. Can someone help me with the…

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## [Can't use image with SVG library](https://discourse.processing.org/t/cant-use-image-with-svg-library/13795)

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**Author:** [@Sahan](https://discourse.processing.org/u/Sahan)\
**Replies:** 0\
**Last updated:** [September 4, 2019, 11:03am UTC](https://discourse.processing.org/t/cant-use-image-with-svg-library/13795 "2019-09-04T11:03:51Z")

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hello I am using processing p3, I want to convert a bitmap image to SVG. i edited one of the programs in SVG libraries of Processing with image() function, it throws an error. as I am new to programming, Pl suggest me …

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## [YAML file editing](https://discourse.processing.org/t/yaml-file-editing/13602)

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**Author:** [@RockyHawk](https://discourse.processing.org/u/RockyHawk)\
**Replies:** 2\
**Last updated:** [August 26, 2019, 2:22pm UTC](https://discourse.processing.org/t/yaml-file-editing/13602 "2019-08-26T14:22:22Z")

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I was wondering if there was a way to edit a YAML file and save the edited version… So it would be something like this maybe: File yaml = new File(System.getProperty("user.home") + "/Desktop/\*.\*"); selectInput("Choose …

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## [Shooting moving circles](https://discourse.processing.org/t/shooting-moving-circles/13791)

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**Author:** [@sbiju72](https://discourse.processing.org/u/sbiju72)\
**Replies:** 2\
**Last updated:** [September 4, 2019, 12:02pm UTC](https://discourse.processing.org/t/shooting-moving-circles/13791 "2019-09-04T12:02:17Z")

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I’m trying to shoot a moving ball. Most of it works (ball moves, hit is detected). Except the the movement of bullet. I can’t get it moving. void setup(){ size(1000,800); } Projectile bullet = new Projectile(); Enem…

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## [G4P ViewListener imported obj render problem](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794)

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**Author:** [@mala](https://discourse.processing.org/u/mala)\
**Replies:** 4\
**Last updated:** [September 4, 2019, 11:49am UTC](https://discourse.processing.org/t/g4p-viewlistener-imported-obj-render-problem/13794 "2019-09-04T11:49:28Z")

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I’m getting a strange effect when trying to render stroke & fill on an imported obj, the stroke appears to only be rendered once at first frame , almost as an orthographic projection, this stroke rotates with the box as …

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## [The background does not work in a second screen](https://discourse.processing.org/t/the-background-does-not-work-in-a-second-screen/13760)

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**Author:** [@bandMast3r](https://discourse.processing.org/u/bandMast3r)\
**Replies:** 1\
**Last updated:** [September 4, 2019, 10:00am UTC](https://discourse.processing.org/t/the-background-does-not-work-in-a-second-screen/13760 "2019-09-04T10:00:44Z")

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I have a laptop and a monitor. At home, I don’t use the laptop’s monitor as the primary monitor. And when I’m at school, my background doesn’t change color, as if it didn’t exist. And it just happens on my laptop screen.…

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