What is GL line strip?
GL_LINE_LOOP: As line strips, except that the first and last vertices are also used as a line. Thus, you get n lines for n input vertices. If the user only specifies 1 vertex, the drawing command is ignored. The line between the first and last vertices happens after all of the previous lines in the sequence.
What is enableVertexAttribArray?
The WebGLRenderingContext method enableVertexAttribArray() , part of the WebGL API, turns on the generic vertex attribute array at the specified index into the list of attribute arrays. Attributes are referenced by an index number into the list of attributes maintained by the GPU.
Do I have WebGL?
To find out if WebGL is enabled in your browser, go to http://get.webgl.org/. To enable WebGL on your browser: Chrome: type “about: flags” in the address bar, then search for WebGL and activate the option.
What is glvertex2i?
The glVertex function commands are used within glBegin/glEnd pairs to specify point, line, and polygon vertices. The current color, normal, and texture coordinates are associated with the vertex when glVertex is called. When only x and y are specified, z defaults to 0.0 and w defaults to 1.0.
How many lines of code is OpenGL?
500 lines
How OpenGL works: software renderer in 500 lines of code | Hacker News.
What is Gl_line_loop?
GL_LINE_LOOP. Draws a connected group of line segments from the first vertex to the last, then back to the first. Vertices n and n+1 define line n. The last line, however, is defined by vertices N and 1. N lines are drawn.
Why are triangle strips efficient?
The primary reason to use triangle strips is to reduce the amount of data needed to create a series of triangles. The number of vertices stored in memory is reduced from 3N to N+2, where N is the number of triangles to be drawn. This allows for less use of disk space, as well as making them faster to load into RAM.
How is the line width defined in WebGL?
The WebGLRenderingContext.lineWidth() method of the WebGL API sets the line width of rasterized lines. The webgl spec, based on the OpenGL ES 2.0/3.0 specs points out that the minimum and maximum width for a line is implementation defined. The maximum minimum width is allowed to be 1.0. The minimum maximum width is also allowed to be 1.0.
Which is library for drawing points in WebGL?
D3FC is a library which extends the D3 library, providing commonly used components to make it easier to build interactive charts. In my last post, I discussed the approach we’ve taken to draw points in WebGL.
How do you add new points in WebGL?
Mouse Interaction Click in the canvas to add a new point to the current draw mode. If close to an existing point, adds a new point at the existing point. Click near an existing point and drag to move it. Release near an existing point to combine the points.
How do you create a polygon in WebGL?
Click create polygon and move the mouse to the position in the canvas where you want to place the object. Click the left mouse button and hold and drag to size the object. Release the left mouse button to finish the creation of the polygon. When you move the mouse over the polygon the outline will highlight in yellow.