# Questions tagged [lines]

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### How do you calculate the nearest point on 2 curves?

Given the points of a line and a quadratic bezier curve, how do you calculate their nearest point? .... Similarly, given the points of 2 curves, how do you get the nearest point?
379 views

### How do you calculate if 2 lines are facing toward or away?

Given the 4 points describing 2 line segments, how do you calculate if line A is towards or away from line B? The 2 lines have a fixed length, and can be measured as distance from x1/y1 to x2/y2.
15k views

### How to make Line Renderer lines stay flat?

I've noticed that as I add more vertexes to a Line Renderer line the line twists and stops being a smooth line. .GIF Here: http://i.imgur.com/hRAhCXM.gif All lines are on the same z level, even if ...
2k views

### How to find path in graph without crossing the walls?

I would like to know how to find path in a graph while having the edges "double-sided". Consider this scenario: I have list of the line segments. These represents "walls" or rather impassable edges (...
2k views

### XNA 2D Spritesheet drawing rendering problem

I'm making a tile-based game, using one spritesheet containing all tile graphics. Each tile has a size of 32x32 pixels. The main problem is: when I draw the tile to the screen, if the tile position ...
493 views

### How to create laser redirection?

Think portal 2, where a laser can go through a cube, and depending on the rotation of that cube, it will redirect it. Examples: Here is my barely functioning code. It works for one cube, I'm able to ...
2k views

### How do I draw a dotted or dashed line?

I'm trying to draw a dashed or dotted line by placing individual segments(dashes) along a path and then separating them. The only algorithm I could come up with for this gave me a dash length that was ...
724 views

### How to order points on a 3D grid such that we can connect them in a line loop correctly

I want to recreate an effect as close as possible to X-Com: Enemy Unkown's movement range feedback: (source: gameinformer.com) The blue line delimits the tiles which the soldier can reach using a ...
4k views

### Enable/ Disable Line Renderer points

I have a Line Renderer component with 4 points, I would like to disable and enable the last 2 points at a certain time. My question is, how would I in code (C#) enable and disable individual Line ...
914 views

### Drawing a lines radiating from every angle using Bresenham line algorithm

I am trying to recreate a image like this ... or just each point Using Bresenham line algorithm, but can't seem to able to do so.. The point i receive from my computation doesn't look like a like, ...
7k views

### LineRenderer sorting order - lines always in front of everything

I have 3 cameras and 3 canvases. Back Camera: depth = -5, Back Canvas: Sorting layer - BackLayer, Camera: depth = 0, Middle Canvas: Sorting layer - MiddleLayer, Camera: depth = 10, Front Canvas: ...
208 views

### How to smooth hand drawn lines?

So I am using Kinect with Unity. With the Kinect, we detect a hand gesture and when it is active we draw a line on the screen that follows where ever the hand is going. Every update the location is ...
109 views

### Why do we get artifacts on objects rendered using depth node + depth render camera on Android?

I've encountered and error I can't seem to find online. I get it on all the water shaders I test, and any thing else that I have a depth node + depth render script on the camera for. I'll share a bit ...
51 views

### Random lines drawn on screen while all vertexes are correct

I'm writing a 2D program in which a monocycle follows a Catmull-Rom spline. My problem is when I write the circle, the drawing goes crazy. There is one line on the screenshot (which seems to be 3 when ...
336 views

### Drawing many separate lines using mouse OpenGL(GLFW/glad)

So, in order to draw a line, I track the coordinates of the mouse, then I add them to the array and capture it as GL_LINE_STRIP_ADJACENCY. However, for example, I completed drawing a line1 at P1 and ...
3k views

### How to correctly draw a 2D polygon in Unity

I'm trying to draw a 2D polygon using GL.Line; however I'm not getting a polygon but separated lines instead. In the example below, I would expect a rectangle formed by the spheres: My code is the ...
963 views

### How to shade hair (line segments) correctly in GLSL

I render my hair geometry in line segments. The problem I have is with the correct shading of the hair. From what I've read I understood that I need the direction of the line segment and the ...
2k views

### LibGDX How can I draw a line at a specific angle

I'm working on a 2D platformer, shooter game and I'm attempting to draw a line to serve as a guide to indicate where the player is shooting. The line should be drawn from the player's sprite to the ...
59 views

### how can I transform a skewed line to a vertical line?

So, I have a line: And I skewed it with x += y * cos(angle) and got something like: My question is, if I have another line segment with that same skew, how can I ...
107 views

### Detect mouse over a line in Phaser

We're developing a game in Phaser as a university project and have come across an obstacle. We need to detect when the mouse is over a line between two points. There are not a lot of lines, definitely ...
119 views

### Why does my shader's Texture become unselected when I run my game?

I'd like to add a custom material to a line that I'm drawing in Unity (using Vectrosity). I'm using Unity's built-in "Unlit/Texture" shader. When I drag a texture from my Resources directory into ...
363 views

### Perspective Projection - Drawing Lines

So I sort of understand the math behind projecting 3d points onto a 2d plane. It's just some simple dividing and multiplication of distances. However I can't seem to wrap my head around projecting ...