## How do I draw a point in OpenGL?

One way to draw primitives is to use the glBegin command to tell OpenGL to begin interpreting a list of vertices as a particular primitive. You then end the list of vertices for that primitive with the glEnd command. glBegin, GL_POINTS tells OpenGL that the succeeding vertices are to be interpreted and drawn as points.

### How do you draw a cylinder in OpenGL?

In order to draw the surface of a cylinder in OpenGL, you must triangulate adjacent vertices counterclockwise to form polygons….The parameters of the cylinder class are;

- the base radius (float)
- the top radius (float)
- the height (float)
- the number of sectors (int)
- the number of stacks (int)
- smoothness (bool)

**How do you draw a circle using Bresenham algorithm?**

Bresenham’s Circle Algorithm:

- Step1: Start Algorithm.
- Step2: Declare p, q, x, y, r, d variables.
- Step3: Enter the value of r.
- Step4: Calculate d = 3 – 2r.
- Step5: Initialize x=0.
- Step6: Check if the whole circle is scan converted.
- Step7: Plot eight points by using concepts of eight-way symmetry.

**How do you draw a sphere in OpenGL?**

In order to draw the surface of a sphere in OpenGL, you must triangulate adjacent vertices to form polygons. It is possible to use a single triangle strip to render the whole sphere. However, if the shared vertices have different normals or texture coordinates, then a single triangle strip cannot be used.

## What kind of shapes can you draw in OpenGL?

The only shapes that OpenGL can draw are points, lines, and triangles,so how do you draw circles and other shapes?

### When to use gluseprogram to draw a shape?

One shader program will be used for drawing some shapes, and additional shader programs will be used when drawing other shapes. Hence, we need to call glUseProgram for the appropriate shader program before drawing any objects that use that shader program. If previous examples, glDrawArrays was called to draw the objects.

**How is the Collatz function defined in OpenGL?**

The Collatz function is defined for a positive integer n as follows. f (n) = 3n+1 if n is odd n/2 if n is even We conside…

**Which is the best way to draw a circle?**

A reasonable approximation of a circle can be drawn using many, many triangles with one vertex at the centre of the circle and the other two vertices sharing the same location as one of the vertices of the triangles next to it on the outer edge of the circle.