http://www.songho.ca/opengl/gl_transform.html#example2
Example: Projection Matrix
This demo application is to show how to manipulate the projection transformation with 6 parameters; left, right, bottom, top, near and far values.
About AActor!!! "UObject" has no member "BeginPlay"
AActor An AActor is an object that is meant to be part of the gameplay experience. AActors are either placed in a level by a designer or created at runtime via gameplay systems. All objects that can be placed into a level extend from this class. Examples include AStaticMeshActor, ACameraActor, and APointLight actors. AActor derives from UObject, so enjoys all of the standard features listed in the previous section. AActors can be explicitly destroyed via gameplay code (C++ or Blueprints) or via the standard garbage collection mechanism when the owning level is unloaded from memory. AActors are responsible for the high-level behaviors of your game’s objects. AActors are also the base type that can be replicated during networking. During network replication, AActors can also distribute information for any UActorComponents owned by that AActor that require network support. AActors have their own behaviors (specialization through inheritance), but they also act as containers for a hie...
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