phong | 易学教程

What is the difference between Phong Shading and Gouraud Shading?

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问题 As I understand it, Gouraud shading calculates light color for each vertex and does interpolation on that color, whereas Phong shading interpolates the normal for each pixel and calculates light color based on that interpolated value. However, when I tried to derive the light color mathematically, I ended up with the same formula for both ways! (Where n1 and n2 are the normals of the two vertices, t is the coefficient for interpolation, L is the light direction, and the plane on the top and

Phong lighting: add specular lighting separately or with ambient and diffuse?

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问题 I am trying to implement Phong lighting. In some tutorials specular lighting is added to ambient and diffuse lighting and then total lighting is multiplied by texture color. I also saw a tutorial where specular lighting was added separately after the addition of ambient and diffuse lights was multiplied with texture color. Here is a fragment shader with both options present and with screenshots. #version 330 core out vec4 FragColor; in vec2 TexCoord; in vec3 normals; in vec3 fragPosition; /

blinn-phong shading with numpy

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问题 I am trying to implement blinn-phong shading in numpy for educational purposes. However I am stuck at debugging what parameters are doing for several days now. My general idea was the following. Since the equation was given for a channel. I apply the model to each color channel to get the relative pixel intensities in the channel, then regroup the channels back togather to have all the image. My lambertian coefficiant does not seem to take into account the light position changes, but it does

Phong shading for shiny Python 3D surface plots

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问题 I'm trying to create aesthetically pleasing 3D plots in Python with specular shading, and thus far have tried using both Matplotlib with 3D axes and surface plots from Mayavi, e.g., from the Mayavi surf examples web page: The results look good, and in Mayavi there does seem to be reasonable control of the lighting, although I can't seem to achieve a "shiny" appearance. In Matlab, this can be achieved by using 'Phong' lighting: see http://www.mathworks.com/matlabcentral/fileexchange/35240

Phong shading for shiny Python 3D surface plots

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I'm trying to create aesthetically pleasing 3D plots in Python with specular shading, and thus far have tried using both Matplotlib with 3D axes and surface plots from Mayavi, e.g., from the Mayavi surf examples web page: The results look good, and in Mayavi there does seem to be reasonable control of the lighting, although I can't seem to achieve a "shiny" appearance. In Matlab, this can be achieved by using 'Phong' lighting: see http://www.mathworks.com/matlabcentral/fileexchange/35240-matlab-plot-gallery-change-lighting-to-phong/content/html/Lighting_Phong.html Therefore, my question is: