OpenGL - lighting with the Phong reflection model (part 2 of 2)

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Code samples derived from work by Joey de Vries, @joeydevries, author of learnopengl.com/
All code samples, unless explicitly stated otherwise, are licensed under the terms of the CC BY-NC 4.0 license as published by Creative Commons, either version 4 of the License, or (at your option) any later version.

Опубликовано:

19 июл 2024

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Комментарии : 14

@abhishektyagi4624 3 года назад

Thank you will.

@glowiever 3 года назад

specular strength > 1 means the model is not conserving energy right?

@miko-puk-puk 3 года назад

Right, the result light value might be greater than the source light value.

@Zentennen 3 года назад

What's the advantage of computing the inverse transpose of the model matrix in the vertex shader as opposed to on the cpu? We could have a uniform normal matrix instead that gets passed in cpu-side.

@isaiahche1214 3 года назад

You are right. The inverse and transpose functions can be really costly on the shader-side, but because this is for demonstration purposes, I'm assuming that he just went ahead and did it in the vertex shader.

@zzador 2 года назад

4:10 You might have used the wrong function here. I think you wanted to use the "pow(x, y)" function here and not the "exp(x)" function that only takes one argument. specular = pow(max(dot(R, C), 0), k) * lightColor

@MrDjRayner 4 года назад

If anyone is a bit lost, or just stumbled on this video and is not following the video series I'd recommend watching the following video first, /watch?v=nS3qwFOPieg, and then coming back to watch this video.

@anonymousdog7851 2 года назад

How does the reflect() formula work?

@MrTomyCJ 6 дней назад

You give it a vector with a certain direction (representing an incoming light ray), the inclination of the surface it will bounce on (represented by its normal vector), and it gives you a vector with the direction that the reflected light ray would have. You can figure out the formula using some geometry and the fact the reflected angle equals the incoming angle, and the reflect() function applies that formula internally.