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Simple question about surfaces & images
Posted 20 giu 2012, 07:13 GMT-4 Geometry, Materials, Parameters, Variables, & Functions Version 4.2a, Version 5.0 2 Replies
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Hello all,
I have what I think is a very simple problem. I would like to define a 3D geometry from a JPEG/PNG image.
What I have tried., reading the forum as well as examples such as Mount St Helen, Rock Fracture and a few others.
What I do at the moment is;
1) create an image in the definitions.
2) create a parametric surface in the geometry (I have included screen shots to illustrate).
However, I do not appear to be able to generate the surface at all. Have I done something silly?!
I am sure this would only take a moment or two for someone who has used images as the basis for a surface to be able to help. I have been able to create a 3D surface using the interpolation function where I define the grid but this is going to be more involved than doing it directly.
Many thanks for your help,
Rob
I have what I think is a very simple problem. I would like to define a 3D geometry from a JPEG/PNG image.
What I have tried., reading the forum as well as examples such as Mount St Helen, Rock Fracture and a few others.
What I do at the moment is;
1) create an image in the definitions.
2) create a parametric surface in the geometry (I have included screen shots to illustrate).
However, I do not appear to be able to generate the surface at all. Have I done something silly?!
I am sure this would only take a moment or two for someone who has used images as the basis for a surface to be able to help. I have been able to create a 3D surface using the interpolation function where I define the grid but this is going to be more involved than doing it directly.
Many thanks for your help,
Rob
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2 Replies Last Post 13 gen 2016, 22:43 GMT-5
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Posted:
1 decade ago
Hi everyone,
I think I may have solved the problem, kind of.
The issue was resolved by defining the image in Global Definitions not the Model Definitions. Once I did that the image and the Parametric Surface worked.
I am still trying to figure out exactly how to use it, but I am getting there.
There is however a follow on question....
If I have an image, and lets say that white pixels are represented as 1 (the range being 0 to 1), is there a way I can set a condition for the Parametric Surface for values above say 0.5 to be ignored?
The example I am working on is a 2D image showing elevation represented in colour. I can import the image and the parametric surface with no problem, but I would like to ignore all heights below a certain level.
Anyone got any ideas?
something like....
image1(s1,s2) for image1(s1,s2)<0.5 or something similar.
Any ideas would be very welcome!!
Rob
I think I may have solved the problem, kind of.
The issue was resolved by defining the image in Global Definitions not the Model Definitions. Once I did that the image and the Parametric Surface worked.
I am still trying to figure out exactly how to use it, but I am getting there.
There is however a follow on question....
If I have an image, and lets say that white pixels are represented as 1 (the range being 0 to 1), is there a way I can set a condition for the Parametric Surface for values above say 0.5 to be ignored?
The example I am working on is a 2D image showing elevation represented in colour. I can import the image and the parametric surface with no problem, but I would like to ignore all heights below a certain level.
Anyone got any ideas?
something like....
image1(s1,s2) for image1(s1,s2)<0.5 or something similar.
Any ideas would be very welcome!!
Rob
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Posted:
9 years ago
dear rob
may i know how to set the parametric surface in the geometry ? or where i can find it ?
i just import the image import the comsol but i can not go to next step since i do not know where to find the so-called"parametric surface"
may i know how to set the parametric surface in the geometry ? or where i can find it ?
i just import the image import the comsol but i can not go to next step since i do not know where to find the so-called"parametric surface"