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fdtd:geometry_modifiers
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fdtd:geometry_modifiers [2018/08/28 15:08] pklapetek |
fdtd:geometry_modifiers [2018/10/09 12:13] pklapetek |
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| - | {{ :samples:img_mod_roughen.png?100|}} | + | {{ :samples:img_mod_grow.png?100|}} |
| - | Sample parameter file: {{samples:mod_roughen.tar.gz|mod_roughen}}. | + | Sample parameter file: {{samples:mod_grow.tar.gz|mod_grow}}. |
| \\ | \\ | ||
| - | A 300x300x300 computational domain with a sphere modified by roughen. | + | A 300x300x300 computational domain with a sphere modified by growth. |
| // | // | ||
| ---- | ---- | ||
| - | The roughness can be also added by a simpler and faster procedure similar to addition of correlated Gaussian noise to an image (but done in 3D). Here, the object position in the computational volume is represented by a probability of having the material on a certain place (1 means object, 0 no object at the beginning of calculation). 3D gaussians are added to random places in the computational volume and using thresholding the new object surface is determined. | + | |
| + | Another possibility is to use vector displacement method, based on correlated noise | ||
| + | that is used to alter object boundaries. This is using a spectral synthesis approach | ||
| + | to create vector arrays of known variance and correlation length. | ||
| ---- | ---- | ||
| // | // | ||
| - | {{ :samples:img_mod_grow.png?100|}} | + | {{ :samples:spectral.png?100|}} |
| - | Sample parameter file: {{samples:mod_grow.tar.gz|mod_grow}}. | + | Sample parameter file: {{samples:mod_spectral.tar.gz|mod_spectral}}. |
| \\ | \\ | ||
| - | A 300x300x300 computational domain with a sphere modified by growth. | + | A 300x300x300 computational domain with a sphere modified by spectral synthesis based vector displacement. |
| + | // | ||
| + | ---- | ||
| + | |||
| + | The roughness can be also added by an alternative procedure similar to addition of correlated Gaussian noise to an image (but done in 3D). Here, the object position in the computational volume is represented by a probability of having the material on a certain place (1 means object, 0 no object at the beginning of calculation). 3D gaussians are added to random places in the computational volume and using thresholding the new object surface is determined. | ||
| + | |||
| + | ---- | ||
| + | // | ||
| + | {{ :samples:img_mod_roughen.png?100|}} | ||
| + | Sample parameter file: {{samples:mod_roughen.tar.gz|mod_roughen}}. | ||
| + | \\ | ||
| + | A 300x300x300 computational domain with a sphere modified by roughen. | ||
| // | // | ||
| ---- | ---- | ||
fdtd/geometry_modifiers.txt · Last modified: 2018/10/11 15:09 by pklapetek
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