Creating wind turbulence

revearz · 2003-12-05T12:38:42

Hi, I''m interested in animating a piece of cloth with some wind turbulence. How would one go about achieving this? Right now, I create a random displacement map of for my cloth and animate it using a sin function so it looks like it''s moving back and forth a bit. What''s a better way? I would like to keep a displacement map ( maybe noise function? ) and just animate this displacement map. This displacement map would be added to the actual cloth to reach the desired effect. Oh, by animating the displacement map, I mean: mad cloth_vertex_pos, cloth_vertex_pos, displacement, sin ( time ) As you can see, it just displaces the cloth_vertex_pos with the function sin( time ). Any thoughts? Thanks!

Graphics and GPU Programming Programming

Started by revearz November 28, 2003 05:17 PM

10 comments, last by revearz 20 years, 4 months ago

revearz

122

Author

December 04, 2003 02:28 PM

Hi .. just confirming something:

F(x) = ((w - z)f(x, y, z) + z * f(x, y, z - w)) / w

If I place this in the triple for loop in the above post, would it be:

float x = nX / 8.0f,      y = nY / 8.0f,      z = nZ / 8.0f,       w = nSizeZ / 8.0f;noise = ((w - z)Noise3D(x, y, z) + z * Noise3D(x, y, z - w)) / w;

Thanks!

DaWizard

122

December 05, 2003 12:38 PM

I'm assuming you're texture size is nSizeX by nSizeY and nSizeZ is number of textures. Assuming you are mapping the x coordinates from 0 to 8, y from 0 to 8 and z from 0 to 8, then:

x = 8.0f * nX / nSizeX
y = 8.0f * nY / nSizeY
z = 8.0f * nZ / nSizeZ

The w that I mentioned in the formula would then be 8.0f.

Hope this helps.

------------------------------------------------
DaWizard
http://www.geocities.com/ahmadkabani
------------------------------------------------

[edited by - DaWizard on December 5, 2003 1:38:42 PM]

------------------------------------------------DaWizardhttp://www.geocities.com/ahmadkabani------------------------------------------------

Creating wind turbulence

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