Vray normal map is a kind of material map used to render 3D scenes, which is usually used to enhance the details and depth of geometric surfaces. This map can be used in many 3D softwares, such as 3ds Max, Maya and 4D cinema. Vray normal mapping is a technology based on OpenGL and DirectX, which can be used on these platforms.

OpenGL and DirectX are two different graphics APIs, which are used to render 3D graphics and animations on computers. OpenGL is cross-platform and can be used on a variety of operating systems and devices. DirectX was developed by Microsoft and mainly used in Windows platform. Vray normal map can be rendered by OpenGL and DirectX, because Vray uses the functions of these two graphics APIs to render and display the map.

In a word, Vray normal mapping is a cross-platform technology, which can be rendered by OpenGL and DirectX. No matter which graphics API you use, you can get high-quality rendering results and enhance the visual effect of 3D scenes.