How to use glDrawElements instead of OpenGL?
Instead of calling an OpenGL function to pass each individual vertex, normal, or color, you can specify separate arrays of vertices, normals, and colors beforehand and use them to define a sequence of primitives (all of the same type) with a single call to glDrawElements.
What happens when you call the glDrawElements function?
When you call the glDrawElements function, it uses count sequential elements from indices to construct a sequence of geometric primitives. The mode parameter specifies what kind of primitives are constructed, and how the array elements are used to construct these primitives. If GL_VERTEX_ARRAY is not enabled, no geometric primitives are generated.
How to make a grid for an easy tile installation?
If you drew everything to scale on that paper including- the cabinets, walls and doorways you would be able to see exactly how all the tiles would fit in that room. Now imagine that piece of paper becoming the actual size of the room and now you can see these lines on the floor. Wouldn’t that be great!
Why do we need a tile grid map?
Tile grid maps are a unique way of visualizing geographic data without needing to accurately represent geographic areas. One challenge when mapping out state specific data at the level of the entire United States is that the smaller states along the northeastern section of the country can be hard to see.
Can a GL function be used to prespecify?
Instead of calling a GL function to pass each individual vertex, normal, texture coordinate, edge flag, or color, you can prespecify separate arrays of vertices, normals, and so on, and use them to construct a sequence of primitives with a single call to glDrawElements .
What are the values of the gl.h function?
The glDrawElements function renders primitives from array data. The kind of primitives to render. It can assume one of the following symbolic values: GL_POINTS, GL_LINE_STRIP, GL_LINE_LOOP, GL_LINES, GL_TRIANGLE_STRIP, GL_TRIANGLE_FAN, GL_TRIANGLES, GL_QUAD_STRIP, GL_QUADS, and GL_POLYGON. The number of elements to be rendered.