More on Half-Life 2 Graphics

A chat log from last night's chat with NVIDIA is up on Bjorn3D. Along the way, the proceedings point the way to a forum post called Half-Life 2 - Anti-aliasing by Valve's Gabe Newell that puts the recently unveiled "problem" with HL2 antialiasing (story) in perspective: He explains how the visual artifacts described in recent reports have been present in other games for years, and that they are showing concern because they have eliminated so many other visual artifacts as well as the amount of light variation they are using. He goes on to discuss solutions:

2) What are potential solutions?

  • Support Centroid Sampling
  • Use Pixel Shaders to Clamp Texture Coordinates

Centroid sampling doesn't have the problem that center sampling does in multi-sample antil-aliasing. ATI has supported this form of anti-aliasing for the 9000 series. The tricky part is enabling this when DirectX doesn't easily expose this.

There's a different trick you can use with hardware, such as NVIDIA's, that doesn't support centroid sampling. Basically you trade off some pixel shader bandwidth to clamp the texture coordinates so that you don't sample texels outside of that polygon's lightmap sub-rect.

Between these two approaches, multi-sample anti-aliasing artifacts should be a non-issue for any DX9-level hardware running Pixel Shader 2.0.

3) How will this look?

We'll release one of the demo movies with the anti-aliasing artifacts in and one with the anti-aliasing changes.

View : : :
19.
 
Re: But Why DX?
Jul 24, 2003, 12:43
19.
Re: But Why DX? Jul 24, 2003, 12:43
Jul 24, 2003, 12:43
 
you are so right, john carmack cant be wrong, APART FROM THE FACT HES A STUPID VIRGIN NERD

Date
Subject
Author
1.
Jul 24, 2003Jul 24 2003
3.
Jul 24, 2003Jul 24 2003
11.
Jul 24, 2003Jul 24 2003
2.
Jul 24, 2003Jul 24 2003
4.
Jul 24, 2003Jul 24 2003
5.
Jul 24, 2003Jul 24 2003
6.
Jul 24, 2003Jul 24 2003
7.
Jul 24, 2003Jul 24 2003
8.
Jul 24, 2003Jul 24 2003
9.
Jul 24, 2003Jul 24 2003
10.
Jul 24, 2003Jul 24 2003
12.
Jul 24, 2003Jul 24 2003
 19.
Jul 24, 2003Jul 24 2003
 Re: But Why DX?
20.
Jul 24, 2003Jul 24 2003
23.
Jul 24, 2003Jul 24 2003
109.
Jul 26, 2003Jul 26 2003
113.
Jul 26, 2003Jul 26 2003
13.
Jul 24, 2003Jul 24 2003
24.
Jul 24, 2003Jul 24 2003
25.
Jul 24, 2003Jul 24 2003
64.
Jul 24, 2003Jul 24 2003
14.
Jul 24, 2003Jul 24 2003
15.
Jul 24, 2003Jul 24 2003
16.
Jul 24, 2003Jul 24 2003
17.
Jul 24, 2003Jul 24 2003
18.
Jul 24, 2003Jul 24 2003
21.
Jul 24, 2003Jul 24 2003
22.
Jul 24, 2003Jul 24 2003
26.
Jul 24, 2003Jul 24 2003
    Re: Whatever
27.
Jul 24, 2003Jul 24 2003
     Re: Whatever
28.
Jul 24, 2003Jul 24 2003
      Re: Whatever
29.
Jul 24, 2003Jul 24 2003
      Re: Whatever
30.
Jul 24, 2003Jul 24 2003
      Re: Whatever
31.
Jul 24, 2003Jul 24 2003
       Re: Whatever
33.
Jul 24, 2003Jul 24 2003
       LMFAO!
35.
Jul 24, 2003Jul 24 2003
        Re: LMFAO!
36.
Jul 24, 2003Jul 24 2003
        Re: LMFAO!
38.
Jul 24, 2003Jul 24 2003
        Re: LMFAO!
39.
Jul 24, 2003Jul 24 2003
         Re: LMFAO!
40.
Jul 24, 2003Jul 24 2003
         Re: LMFAO!
48.
Jul 24, 2003Jul 24 2003
          Re: LMFAO!
51.
Jul 24, 2003Jul 24 2003
           Re: LMFAO!
34.
Jul 24, 2003Jul 24 2003
      Re: Whatever
32.
Jul 24, 2003Jul 24 2003
     Re: Whatever
37.
Jul 24, 2003Jul 24 2003
45.
Jul 24, 2003Jul 24 2003
46.
Jul 24, 2003Jul 24 2003
49.
Jul 24, 2003Jul 24 2003
55.
Jul 24, 2003Jul 24 2003
57.
Jul 24, 2003Jul 24 2003
59.
Jul 24, 2003Jul 24 2003
61.
Jul 24, 2003Jul 24 2003
      Go Gabe
62.
Jul 24, 2003Jul 24 2003
     Re: No subject
63.
Jul 24, 2003Jul 24 2003
      Re: No subject
65.
Jul 24, 2003Jul 24 2003
       Re: No subject
72.
Jul 24, 2003Jul 24 2003
73.
Jul 24, 2003Jul 24 2003
     Re: No subject
75.
Jul 24, 2003Jul 24 2003
     Re: No subject
53.
Jul 24, 2003Jul 24 2003
54.
Jul 24, 2003Jul 24 2003
56.
Jul 24, 2003Jul 24 2003
58.
Jul 24, 2003Jul 24 2003
60.
Jul 24, 2003Jul 24 2003
67.
Jul 24, 2003Jul 24 2003
69.
Jul 24, 2003Jul 24 2003
74.
Jul 24, 2003Jul 24 2003
77.
Jul 24, 2003Jul 24 2003
78.
Jul 24, 2003Jul 24 2003
79.
Jul 24, 2003Jul 24 2003
80.
Jul 24, 2003Jul 24 2003
        Women 101
81.
Jul 24, 2003Jul 24 2003
         Re: Women 101
91.
Jul 24, 2003Jul 24 2003
         Chick with crowbar
85.
Jul 24, 2003Jul 24 2003
87.
Jul 24, 2003Jul 24 2003
         Work ! What's work ?????
88.
Jul 24, 2003Jul 24 2003
89.
Jul 24, 2003Jul 24 2003
90.
Jul 24, 2003Jul 24 2003
92.
Jul 24, 2003Jul 24 2003
93.
Jul 24, 2003Jul 24 2003
            Re: yeah, off topic I agree, but...
94.
Jul 24, 2003Jul 24 2003
             Re: yeah, off topic I agree, but...
106.
Jul 25, 2003Jul 25 2003
            Re: yeah, off topic I agree, but...
107.
Jul 25, 2003Jul 25 2003
             This discussion is ....
108.
Jul 25, 2003Jul 25 2003
              Re: This discussion is ....
110.
Jul 26, 2003Jul 26 2003
               Re: This discussion is ....
41.
Jul 24, 2003Jul 24 2003
42.
Jul 24, 2003Jul 24 2003
43.
Jul 24, 2003Jul 24 2003
44.
Jul 24, 2003Jul 24 2003
66.
Jul 24, 2003Jul 24 2003
47.
Jul 24, 2003Jul 24 2003
50.
Jul 24, 2003Jul 24 2003
52.
Jul 24, 2003Jul 24 2003
68.
Jul 24, 2003Jul 24 2003
70.
Jul 24, 2003Jul 24 2003
71.
Jul 24, 2003Jul 24 2003
76.
Jul 24, 2003Jul 24 2003
82.
Jul 24, 2003Jul 24 2003
83.
Jul 24, 2003Jul 24 2003
84.
Jul 24, 2003Jul 24 2003
86.
Jul 24, 2003Jul 24 2003
95.
Jul 24, 2003Jul 24 2003
96.
Jul 24, 2003Jul 24 2003
97.
Jul 24, 2003Jul 24 2003
98.
Jul 24, 2003Jul 24 2003
101.
Jul 25, 2003Jul 25 2003
102.
Jul 25, 2003Jul 25 2003
103.
Jul 25, 2003Jul 25 2003
104.
Jul 25, 2003Jul 25 2003
105.
Jul 25, 2003Jul 25 2003
99.
Jul 24, 2003Jul 24 2003
100.
Jul 25, 2003Jul 25 2003
117.
Jul 29, 2003Jul 29 2003
118.
Jul 29, 2003Jul 29 2003
   Re: Women
111.
Jul 26, 2003Jul 26 2003
112.
Jul 26, 2003Jul 26 2003
114.
Jul 27, 2003Jul 27 2003
115.
Jul 27, 2003Jul 27 2003
116.
Jul 29, 2003Jul 29 2003