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LiveLink geometry layout design
Posted Jun 27, 2016, 10:35 a.m. EDT Interfacing, Geometry Version 5.2a 5 Replies
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Hi,
I am using Matlab LiveLink and am trying to create a layout for optical reflectors. My Problem is the following: I am looking at about 2000 reflectors and want them to form a union so I don't have to click on every single one and set their properties seperatly every time I generate a new layout.
I have prepared a Codefragment that demonstrates my Problem:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
geom1 = model.geom.create('geom1',3);
wp1 = geom1.feature.create('wp1','WorkPlane');
wp1.set('planetype','quick');
wp1.set('quickplane','xy');
refl_union = wp1.geom.feature.create('refl_union', 'Union');
for i=1:10
refl_geom_name{i} = wp1.geom.feature.create(['r' num2str(i)], 'BezierPolygon');
refl_geom_name{i}.set('type', 'closed');
refl_geom_name{i}.set('p', [i i+0.5 i+0.5 i ; 0 0 2 2]);
wp1.geom.feature.create(['refl_csol' num2str(i)],'ConvertToSolid');
wp1.geom.feature(['refl_csol' num2str(i)]).selection('input').set(['r' num2str(i)]);
refl_union.selection('input').object('geom1');
refl_union.selection('input').set(['refl_csol' num2str(i)]);
end
ext1 = geom1.feature.create('ext1','Extrude');
ext1.selection('input').set({'wp1'});
ext1.set('distance',5);
geom1.run;
mphgeom(model,'geom1');
My Intention was to create one geometrical Object (refl_union) and one by one add the objects to it during each itteration of the for loop. However this does not seem to work. The Code works fine till I try to form a Union, what am I missing?
Thanks
Mark
I am using Matlab LiveLink and am trying to create a layout for optical reflectors. My Problem is the following: I am looking at about 2000 reflectors and want them to form a union so I don't have to click on every single one and set their properties seperatly every time I generate a new layout.
I have prepared a Codefragment that demonstrates my Problem:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
geom1 = model.geom.create('geom1',3);
wp1 = geom1.feature.create('wp1','WorkPlane');
wp1.set('planetype','quick');
wp1.set('quickplane','xy');
refl_union = wp1.geom.feature.create('refl_union', 'Union');
for i=1:10
refl_geom_name{i} = wp1.geom.feature.create(['r' num2str(i)], 'BezierPolygon');
refl_geom_name{i}.set('type', 'closed');
refl_geom_name{i}.set('p', [i i+0.5 i+0.5 i ; 0 0 2 2]);
wp1.geom.feature.create(['refl_csol' num2str(i)],'ConvertToSolid');
wp1.geom.feature(['refl_csol' num2str(i)]).selection('input').set(['r' num2str(i)]);
refl_union.selection('input').object('geom1');
refl_union.selection('input').set(['refl_csol' num2str(i)]);
end
ext1 = geom1.feature.create('ext1','Extrude');
ext1.selection('input').set({'wp1'});
ext1.set('distance',5);
geom1.run;
mphgeom(model,'geom1');
My Intention was to create one geometrical Object (refl_union) and one by one add the objects to it during each itteration of the for loop. However this does not seem to work. The Code works fine till I try to form a Union, what am I missing?
Thanks
Mark
5 Replies Last Post Jul 8, 2016, 5:22 a.m. EDT
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Posted:
8 years ago
Hi
There are many ways to solve your problem
1) Create your geometry without the union. Save the resulting model using mphsave to an MPH-file. Load the MPH-file into the Comsol Desktop. Make the union there. Save the model as an M-file and then you can see what commands you need in order to make the union. I.e. you create the union after you have extruded all your components.
...but I don't think you have to make the union at all
2) Look a the Extrude node (using Comsol Desktop). It has a section for "Selections of resulting entities". If you place a checkmark here you can use the selection name when settings things up later. A list of entities is much easier to handle than large, complicated geometries.
More ideas:
- Use the array transformation for making copies of your geometries in the work plane (if that makes sense for your reflectors).
- Use the selections tools on the Component->Definitions->Selections menu to create more complicated sets of selections if you need so
--
Lars Gregersen
Comsol Denmark
There are many ways to solve your problem
1) Create your geometry without the union. Save the resulting model using mphsave to an MPH-file. Load the MPH-file into the Comsol Desktop. Make the union there. Save the model as an M-file and then you can see what commands you need in order to make the union. I.e. you create the union after you have extruded all your components.
...but I don't think you have to make the union at all
2) Look a the Extrude node (using Comsol Desktop). It has a section for "Selections of resulting entities". If you place a checkmark here you can use the selection name when settings things up later. A list of entities is much easier to handle than large, complicated geometries.
More ideas:
- Use the array transformation for making copies of your geometries in the work plane (if that makes sense for your reflectors).
- Use the selections tools on the Component->Definitions->Selections menu to create more complicated sets of selections if you need so
--
Lars Gregersen
Comsol Denmark
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Posted:
8 years ago
Thank you very much for your help! I have solved my problem thanks to you and your tipps helped me with some other issues as well.
Regards
Mark
Regards
Mark
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Posted:
8 years ago
Hi,
I have finished my program succesfully however I have stumbled upon another problem. I have programmed my layout to be created in 2D and 3D. In 3D I have done this by extrusion, since all extruded geometrys contribute to a list. In 2D this is not possible so I used the function 'contributeto'.
However this seems to be a very slow process since my 3D layout takes about 1,5 hours (including geom.run) to create and my 2D Layout takes about 9 hours. I do not understand this since 3D should take longer to create.
Here is an examplecode:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
geom1 = model.geom.create('geom1',2);
tic
model.geom('geom1').selection.create('csel1', 'CumulativeSelection');
model.geom('geom1').selection('csel1').label('Waveguide_union');
for i=1:300
refl_geom_name{i} = geom1.feature.create(['r' num2str(i)], 'BezierPolygon');
refl_geom_name{i}.set('type', 'closed');
refl_geom_name{i}.set('p', [i i+0.5 i+0.5 i ; 0 0 2 2]);
geom1.feature.create(['refl_csol' num2str(i)],'ConvertToSolid');
geom1.feature(['refl_csol' num2str(i)]).selection('input').set(['r' num2str(i)]);
%model.geom('geom1').feature(['r' num2str(i)]).set('contributeto', 'csel1');
end
toc
geom1.run;
figure;
mphgeom(model,'geom1');
If I run this once with and without the commented line in the for loop it takes twice as long with 'contributeto'! And this loop itterates to 300, whilst my programm goes to about 2000. Is there a faster way to solve this?
Regards, Mark
I have finished my program succesfully however I have stumbled upon another problem. I have programmed my layout to be created in 2D and 3D. In 3D I have done this by extrusion, since all extruded geometrys contribute to a list. In 2D this is not possible so I used the function 'contributeto'.
However this seems to be a very slow process since my 3D layout takes about 1,5 hours (including geom.run) to create and my 2D Layout takes about 9 hours. I do not understand this since 3D should take longer to create.
Here is an examplecode:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
geom1 = model.geom.create('geom1',2);
tic
model.geom('geom1').selection.create('csel1', 'CumulativeSelection');
model.geom('geom1').selection('csel1').label('Waveguide_union');
for i=1:300
refl_geom_name{i} = geom1.feature.create(['r' num2str(i)], 'BezierPolygon');
refl_geom_name{i}.set('type', 'closed');
refl_geom_name{i}.set('p', [i i+0.5 i+0.5 i ; 0 0 2 2]);
geom1.feature.create(['refl_csol' num2str(i)],'ConvertToSolid');
geom1.feature(['refl_csol' num2str(i)]).selection('input').set(['r' num2str(i)]);
%model.geom('geom1').feature(['r' num2str(i)]).set('contributeto', 'csel1');
end
toc
geom1.run;
figure;
mphgeom(model,'geom1');
If I run this once with and without the commented line in the for loop it takes twice as long with 'contributeto'! And this loop itterates to 300, whilst my programm goes to about 2000. Is there a faster way to solve this?
Regards, Mark
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Posted:
8 years ago
Hi Mark
In your case it seems as if the Cumulative Selections take an unreasonable time to create.
You are better off using a union (and adding a selection to that). The following code takes 43 seconds to run using Comsol 5.2a:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
model.hist.disable
geom1 = model.geom.create('geom1',2);
N = 2000
tic
rtags = cell(N,1);
for i=1:N
rtags{i} = ['r' num2str(i)];
gf = geom1.feature.create(rtags{i}, 'BezierPolygon');
gf.set('type', 'closed');
gf.set('p', [i i+0.5 i+0.5 i; 0 0 2 2]);
gf.set('type', 'solid');
end
model.geom('geom1').selection.create('csel1', 'CumulativeSelection');
model.geom('geom1').selection('csel1').label('Waveguide_union');
model.geom('geom1').create('uni1', 'Union');
model.geom('geom1').feature('uni1').selection('input').set(rtags);
model.geom('geom1').feature('uni1').set('contributeto', 'csel1');
geom1.run;
toc
mphgeom(model,'geom1')
--
Lars Gregersen
Comsol Denmark
In your case it seems as if the Cumulative Selections take an unreasonable time to create.
You are better off using a union (and adding a selection to that). The following code takes 43 seconds to run using Comsol 5.2a:
import com.comsol.model.*;
import com.comsol.model.util.*;
model = ModelUtil.create('Model');
model.hist.disable
geom1 = model.geom.create('geom1',2);
N = 2000
tic
rtags = cell(N,1);
for i=1:N
rtags{i} = ['r' num2str(i)];
gf = geom1.feature.create(rtags{i}, 'BezierPolygon');
gf.set('type', 'closed');
gf.set('p', [i i+0.5 i+0.5 i; 0 0 2 2]);
gf.set('type', 'solid');
end
model.geom('geom1').selection.create('csel1', 'CumulativeSelection');
model.geom('geom1').selection('csel1').label('Waveguide_union');
model.geom('geom1').create('uni1', 'Union');
model.geom('geom1').feature('uni1').selection('input').set(rtags);
model.geom('geom1').feature('uni1').set('contributeto', 'csel1');
geom1.run;
toc
mphgeom(model,'geom1')
--
Lars Gregersen
Comsol Denmark
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Posted:
8 years ago
Thank you once again for your help! Your solution works like a charm. My revised programm ran for about 1,5 hours but with your solution it now takes about 40 seconds!