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| An alternative source method is to cast rays from whole computational boundary at once, already assuming that it was totally reflected outside of it - so casting both rays propagating towards sample and mirrored rays. This is done in source method = 1. | An alternative source method is to cast rays from whole computational boundary at once, already assuming that it was totally reflected outside of it - so casting both rays propagating towards sample and mirrored rays. This is done in source method = 1. | ||
| - | Finally, we can use only the top boundary for casting the rays and let them to periodically repeat. This is the source method 3. In this case we artificially create the periodic boundary near to the computational domain boundary, on basis of the source wavelength. All the rays incoming to this boundary are transversed back to the start of the computational domain. Obviously, this case is suitable only for periodic samples. On the other hand, for such samples it is the only method that can reproduce the realistic behavior of the incoming rays. | + | We can also use only the top boundary for casting the rays and let them to periodically repeat. This is the source method 2. In this case we artificially create the periodic boundary near to the computational domain boundary, on basis of the source wavelength. All the rays incoming to this boundary are transversed back to the start of the computational domain. Obviously, this case is suitable only for periodic samples. On the other hand, for such samples it is the only method that can reproduce the realistic behavior of the incoming rays. |
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| + | Finally, source method 3 means casting rays only from top, but not doing any periodical repetition. This is usefull namely for debugging the method 2 or when we don't want to have something periodic in our computational domain. | ||
| The different source methods are illustrated on the figure below: | The different source methods are illustrated on the figure below: | ||
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| which sets number of phases to use in calculation, directly prolongs the process. | which sets number of phases to use in calculation, directly prolongs the process. | ||
| Here only two phases would be used, but any number, equally distributed along 0-PI region could be used. | Here only two phases would be used, but any number, equally distributed along 0-PI region could be used. | ||
| + | Multiple phases evaluation is important namely in case when the voxel size is larger or similar to wavelength which leads to a moire effect. By using multiple phases evaluation, this effect can be removed as shown below: | ||
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| + | {{ :modes.png?600 |}} | ||
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| If we have only single object in the computational domain we might be interested in using only subset of rays that have chance to intersect with it. To search for material with index of 2 and illuminate only areas where it can be reached we can run | If we have only single object in the computational domain we might be interested in using only subset of rays that have chance to intersect with it. To search for material with index of 2 and illuminate only areas where it can be reached we can run | ||
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| where only a single material with given index is evaluated without really creating any mesh (only from | where only a single material with given index is evaluated without really creating any mesh (only from | ||
| vector data entries). This is used mostly for some debugging purposes. | vector data entries). This is used mostly for some debugging purposes. | ||
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| + | An alternative to all the raytracing is use of the matrix method. This is implemented in z (so the computational volume is sliced in z automatically) and can be called as | ||
| + | |||
| + | <code> | ||
| + | MATRIXBASED | ||
| + | 1 | ||
| + | </code> | ||
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| - | {{ :modes.png?600 |}} | ||
source_regimes.1516816264.txt.gz · Last modified: 2018/01/24 18:51 by 89.103.122.186
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