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Gouraud
Phong
The smooth shading algorithm used in OpenGL
glShadeModel( GL_SMOOTH )
Adv: better specular highlight, not
in OpenGL
Lighting is calculated for each of the polygon vertices
Compute lighting during rasterization
Colors are interpolated for interior pixels.. (normals are not needed for interior
Interpolate the normals across polygon
Per-vertex lighting calculation
Instead of interpolation, we calculate lighting for each pixel inside the polygon
(per-pixel lighting)
Normal is needed for each vertex
Need normals for all the pixels
Per-vertex normal can be computed by
averaging the adjacent face normals
Need to map the normal back to world or eye space
Problem--Lighting in the polygon interior can be
Inaccurate
Problem: Slow---Not supported by OpenGL, but now graphics cards have pixel shaders that can be used to do this quickly
What else can I help you with?
Difference between Gouraud and Phong's method of shading?
Gouraud Shading is effective for shading surfaces which reflect light diffusely. Specular reflections can be modelled using Gouraud Shading, but the shape of the specluar highlight produced is dependent on the relative positions of the underlying polygons. The advantage of Gouraud shading is that it is computationally the less expensive of the two model, only requring the evaluation of the intensity equation at the polygon vertices, and then bilinear interpolation of these values for each pixels. Phong Shading produces highlights which are much less dependent on the underlying polygons. However, more calculation are required, involving the interpolation of the surface normal and the evaluation of the intensity function for each pixel.
What is phong shading technique?
Phong Shading produces highlights which are much less dependent on the underlying polygons. However, more calculation are required, involving the interpolation of the surface normal and the evaluation of the intensity function for each pixel.
What is the distance between japan negata ken city to china hai phong city?
Hai phong city is not in china
When was Phong Bui born?
Phong Bui was born in 1964.
What is Hai Phong's population?
The population of Hai Phong is 1,884,685.
When did Dang Phong die?
Dang Phong died in 2010.
When was Dang Phong born?
Dang Phong was born in 1937.
What nicknames does Billy Phong go by?
Billy Phong goes by Bobbibong.
How tall is Phong Atwood Vo?
Phong Atwood Vo is 5' 9".
What has the author Pho Phong written?
Pho Phong has written: 'Troi phat'
What is Cao Phong District's population?
The population of Cao Phong District is 40,170.
What is Tuy Phong District's population?
Tuy Phong District's population is 90,819.
