What is GL point size?
Description. glPointSize specifies the rasterized diameter of both aliased and antialiased points. Using a point size other than 1 has different effects, depending on whether point antialiasing is enabled. Point antialiasing is initially disabled.
How do I change the size of points in OpenGL?
I would like the points to have different sizes based on an attribute of the data. Such as each point having x, y, z, and a size attribute. I’m using frame buffers right now in java. Could I possibly use vertex shaders for this?
What is glVertex2f in OpenGL?
The function glVertex2f specifies the x and y coordinates of the vertex, and the z coordinate is set to zero. There is also a function glVertex3f that specifies all three coordinates. The “2” or “3” in the name tells how many parameters are passed to the function.
What is glColor3f in OpenGL?
glColor3f can be called in between glBegin and glEnd. When it is used this way, it can be used to give each vertex its own color. The resulting rectangle is then shaded with an attractive color gradient, as shown on the right.
How do you increase line thickness in OpenGL?
1 Answer. OpenGL implementations are not required to support rendering of wide lines. You can query the range of supported line widths with: GLfloat lineWidthRange[2] = {0.0f, 0.0f}; glGetFloatv(GL_ALIASED_LINE_WIDTH_RANGE, lineWidthRange); // Maximum supported line width is in lineWidthRange[1].
What is OpenGL es 3.0 used for?
OpenGL for Embedded Systems (OpenGL ES) is an application programming interface (API) for advanced 3D graphics targeted at handheld and embedded devices. Indeed, OpenGL ES 3.0 is already supported on devices using Android 4.3+ and on the iPhone 5s with iOS7.
What is glutMainLoop in OpenGL?
glutMainLoop tells the program to enter the GLUT event processing loop. (This just means the program sits and waits for things to happen, such as window refreshes, window resizes, mouse clicks, key presses, etc.) glutMainLoop never exits, so it should always be the last line of the main program.
When to use GL _ pointsize in shader?
It may be written at any time during shader execution. If GL_PROGRAM_POINT_SIZE is enabled, gl_PointSize is used to determine the size of rasterized points, otherwise it is ignored by the rasterization stage.
When is the value of GL _ pointsize undefined?
The value of gl_PointSize (or the gl_PointSize member of the gl_out [] array, in the case of the tessellation control shader) is undefined after the vertex, tessellation control, and tessellation evaluation shading stages if the corresponding shader executable does not write to gl_PointSize.
When to use GL pointsize for rasterization?
If GL_PROGRAM_POINT_SIZE is enabled, gl_PointSize is used to determine the size of rasterized points, otherwise it is ignored by the rasterization stage.