Surface normal is a vital concept in 3D graphics that refers to a hypothetical line parallel to a polygon’s surface. Its main purpose is to determine the reflectance of light falling on an object in a 3D scene.
Calculating Surface Normal
Surface normal can be calculated in two ways. One is at a triangle’s vertex, where it is the average of all the adjacent vertices. Another way is to calculate it for each pixel of the triangle, as in Phong shading.
Importance of Surface Normal
Surface normal plays a crucial role in determining the reflection of light in a 3D scene. Without it, objects in a 3D scene would appear flat and lifeless. Surface normals help to add depth and realism to 3D models, making them appear more lifelike to the viewer.
FAQs
What is the use of surface normal?
Surface normal is used to determine the reflectance of light falling on an object in a 3D scene. It helps to add depth and realism to 3D models.
How is surface normal calculated?
Surface normal can be calculated at a triangle’s vertex, where it is the average of all the adjacent vertices. Another way is to calculate it for each pixel of the triangle, as in Phong shading.
Conclusion
Surface normal is a critical concept in 3D graphics that helps to add depth and realism to 3D models. By improving the reflection of light on objects in a 3D scene, surface normals give a more lifelike appearance to the viewer.
