Dear STKO Team，
Hi！I am studying your videos on Youtube (https://www.youtube.com/watch?v=iDgFM-ZjHVo) to build my own pile-soil model.
In this video, I noticed that you will draw a small square in the middle of a circular pile and connect the four vertices of this square to the pile bearing with a line, I would like to know why this square is there and what is the basis for drawing this square? How should its size be decided?
Also, going back to the question in the title, the line connecting the small square to the pile bearing will intersect with the circle of the pile, how should I do it so that the point falls precisely at the intersection of the line and the circle when using the point drawing operation? When I use the draw point operation, the intersection point is not automatically selected. (I've uploaded the diagram in the attachment)
For those of you reading this (STKO team or other learners), you can see that the questions I'm asking are very basic, and I'd like to find some tutorials on these basics to help me learn, so please let me know if you have any.
Thanks a lot!
Add VERTEX to the intersection of the two lines AND some Geometry question
Add VERTEX to the intersection of the two lines AND some Geometry question
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Re: Add VERTEX to the intersection of the two lines AND some Geometry question
If my presentation is not clear, please let me know.
Re: Add VERTEX to the intersection of the two lines AND some Geometry question
The square and all other construction lines are done in order to have a structured hexahedron mesh.
To have this kind of mesh, you need to have volumes that are bounding exactly by 6 faces (like a parallelepiped).
Therefore, they can be extruded from faces that are bounded exactly by 4 edges (and 4 corner vertices).
That's why a I need all those construction lines.
The only thing you need to do, is to draw you circle so that the second point (when you click for the second time during the circle command) is at a direction = 45° with respect to the global X axis.
In this way the circle point will coincide with one of those 45°-inclined lines.
Once you're done with the lines, you can use the Planar command to create planar faces from a grid of lines
To have this kind of mesh, you need to have volumes that are bounding exactly by 6 faces (like a parallelepiped).
Therefore, they can be extruded from faces that are bounded exactly by 4 edges (and 4 corner vertices).
That's why a I need all those construction lines.
The only thing you need to do, is to draw you circle so that the second point (when you click for the second time during the circle command) is at a direction = 45° with respect to the global X axis.
In this way the circle point will coincide with one of those 45°-inclined lines.
Once you're done with the lines, you can use the Planar command to create planar faces from a grid of lines
Re: Add VERTEX to the intersection of the two lines AND some Geometry question
Thank you for your responses!
As you said, the squares and other building lines are for creating structured hexahedral meshes later. So there is no limit to the size of this square right? It only needs to be on the inside of the circle?
I noticed that only when the second point of the circle falls on the 45° diagonal, the intersection can be automatically selected when using the Point operation at the intersection of the drawn circle and the 45° diagonal.
But this then brings another problem, if I use the mouse to land the second point on the diagonal line (for example on the midpoint of the diagonal line), this will be easy. But usually when we draw a circle, we want to specify the diameter of the circle exactly, so how do I do it so that the second point of the circle remains at 45° to the global X axis while still entering the radius value I want for the circle?
I noticed that when drawing a circle the command box prompts for the degree, but when I enter 45° it prompts for invalid command input.
As you said, the squares and other building lines are for creating structured hexahedral meshes later. So there is no limit to the size of this square right? It only needs to be on the inside of the circle?
I noticed that only when the second point of the circle falls on the 45° diagonal, the intersection can be automatically selected when using the Point operation at the intersection of the drawn circle and the 45° diagonal.
But this then brings another problem, if I use the mouse to land the second point on the diagonal line (for example on the midpoint of the diagonal line), this will be easy. But usually when we draw a circle, we want to specify the diameter of the circle exactly, so how do I do it so that the second point of the circle remains at 45° to the global X axis while still entering the radius value I want for the circle?
I noticed that when drawing a circle the command box prompts for the degree, but when I enter 45° it prompts for invalid command input.
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- 1.jpg (20.29 KiB) Viewed 4447 times
Re: Add VERTEX to the intersection of the two lines AND some Geometry question
You're right, if you type the radius, STKO will automatically create a point in the X direction of the current workplane.
You can either rotate the circle after you create it (using the Rotate command), or you can first create a workplane in an inclined (45°) direction, then you draw there.
You can either rotate the circle after you create it (using the Rotate command), or you can first create a workplane in an inclined (45°) direction, then you draw there.
- WPLANE.png (68.3 KiB) Viewed 4413 times
Re: Add VERTEX to the intersection of the two lines AND some Geometry question
Thank you for your responses!
In your reply of December 16, 2022, you said that "squares and all other building lines" are meant to have a structured hexahedral grid. As I understand it, the large square on the outside of the pile, and the straight line extending outward to the edge of the soil on all four sides of the large square, also serve this purpose, right?
If my pile is in the form of a high bearing, do I draw such squares and building lines for the bearing as well, for the purpose of creating a hexahedral grid?
I put the model I made below, please do you see if this is right?
In your reply of December 16, 2022, you said that "squares and all other building lines" are meant to have a structured hexahedral grid. As I understand it, the large square on the outside of the pile, and the straight line extending outward to the edge of the soil on all four sides of the large square, also serve this purpose, right?
If my pile is in the form of a high bearing, do I draw such squares and building lines for the bearing as well, for the purpose of creating a hexahedral grid?
I put the model I made below, please do you see if this is right?
Last edited by Charon on Mon Jul 03, 2023 2:59 am, edited 1 time in total.
Re: Add VERTEX to the intersection of the two lines AND some Geometry question
From the image it seems fine, but if you share your model I can check it better
Sorry, I did not understand this question, could you elaborate it more?f my pile is in the form of a high bearing, do I draw such squares and building lines for the bearing as well, for the purpose of creating a hexahedral grid?