Blinn–Phong Shading Model

本文介绍Blinn-Phong反射模型,又称修改后的Phong反射模型,该模型在计算机图形学中被广泛应用,特别是在OpenGL中作为默认的着色模型。文中对比了Blinn模型与Phong模型之间的差异,并解释了如何通过调整指数来匹配两种模型的高光大小。

Also called Blinn–Phong reflection model or modified Phong reflection model.  Trade visual precision for computing efficiency.

Default shading model used in OpenGL.

image  image

Differences (ref: wikipedia)

The halfway angle is smaller than the angle we want in Phong's model, but considering that Phong is using, we can set an exponent so that is closer to the former expression.

The size of the specular highlights can be matched in this way very closely to a corresponding Phong reflection, but they will always retain a subtly different shape.

image

转载于:https://www.cnblogs.com/bruce81/p/3175721.html

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