Basically, the author indicates moving the construction curves to make the constrained curves fit the drawing. The construction curves were created with the history command allowing the two curves that build the side windows to follow any movement of the control points.
But in his case, the construction curves always remain touching each other. In my case when I move a control point the structure brakes. Although the curves follow the construction ones I believe the main “frame” should not break apart:
Hi Bruno - I am not sure what you mean by this - History does not construct curves - so you used a command that supports history to generate some curves, like Project or ? Can you post your file?
I think that you need to hear from Alejandro Zapata (@Alejo) to get sorted on this. If he doesn’t respond here, try the contact form on his site learnrhino.com.
I am sorry for the misunderstanding.
I meant there are two curves I have to accommodate. Those two curves are following construction curves. When I move the construction curves the two curves follow.
But in his image, the construction curves are always touching each other. In mine, If I move the construction curves I lose the contact points between them (marked in red).
I can also share the file, but I need to erase the blueprints since I paid for them and I am sure there are not sharable.
Maybe that is what he did. In the end, snap them back…I am not sure how he did it. I am having a really hard time accommodating the curves to the blueprint.
You can see it does not make much sense. The construction curves (orange) are not touching, but what is worst, the short construction curve (closest to the camera) bends to the negative side…which does not make sense in my head.
So the top view and side view look correct. Construction curves look awful.
What do you think? Should I ignore the construction curve shapes as long as the green ones match the drawing?
I upload the model here. I can see when I turn on the Emap for reflections…the resultant surface do not look perfectly smooth. You can see it has some dips…
I think that you miss the possibility of pulling the curve to the surface (Pull command with loose option) or generating a curve from two other curves (_Crv2View command). There is also a thing about curve rebuild (rebuild command) because your points count on the curve is much too dense IMO (dense curves dense surface).
Other things that IMO you should generate some side windows surface, sculpt it with gumball or MoveUVN and when that surface will be perfect you can pull those green curves there.
I think that sometimes is needed to build a simple surface with a perfect shape to pull some curves there (but with the loose option to not make a denser surface which kills the possibility of using MoveUVN).
For creating a helper surface from not touched curves you can use the patch command but it would be better for temporary surfaces than for the final.
Hi. FYI I am following a tutorial. The techniques employed are those described in the ebook.
I will double-check, but he did not rebuild the curves after projecting them. I am not sure he forgot to describe one step where he applied rebuild to the green curves.
I hope the author replies about it. I am quite eager to continue, but somehow this particular step feels quite confusing.
-All the windows surface is built based on the “A” curve.
“B” and “C” curve are absolutely wrong, make them again following the procedure explained from the page 40 to 43. The curves are built with the 3 point circle, these are particularly important since they define the curvature of the glass and it usually needs to be kind of constant in order to be able to manufacture it. You have the curvature of these two curves totally reversed. Make sure to stablish the first point of the circle at the first endpoint of the “A” curve. Once built the “B” curve, in the back view, which is the view you use to built it, rotate it to match the blueprint position using the “A” point as an pivot point.
Replicate (copy) the “B” curve at the opposite endpoint of the “A” curve and the midpoint and adjust the rotation following the blueprint.
The “E” curve is just an interpolated curve connecting the endpoints of “B,C,D”.
Jumping to the projection part.
Now following the steps on page 54, activate record history and build the window surface using the curves we were working on.
-Create the projection curves ACAP (Ass Clean as Possible), following the book. By now you should have a proper surface to work with (see attachments of page 56).
Now just follow the steps from page 57 - 60, trim the window and you are done!
-Hope this helps. Best
PS: I’m gonna post the pages just to share it with the Rhino Forum community an also follow the procedure in this specific topic, any other reproduction or reproduction is forbidden.
Thank you! I think something got lost in translation.
The image I am showing (wrong curves) is not my process of building the curves.
I did follow that and I have them as you show. All the steps you kindly explained were followed.
I am having trouble with page 58. I do have the curves similarly to your 4.5
But when I try to fix the boundary to fit it on top of the window lines (4.6), it gets all detached and wrong. I can see you were able to accommodate those 2 curves by moving the boundary without losing the connection of the boundary. How did you move the frame without losing the connection between all your curves? I can share my file privately.
Unfortunately, I could not get a response that would help me continue the project.
I am trying to provide better documentation:
As you can see, the window frame curves follow the structure (magenta). I can not understand how the author fixed the construction curves to match the curves to the window (orange) frame without losing the relationship between the construction boundaries.
You can see the image he shares in the pdf. Following is an image showing the tutorial before fixing the curves:
Hi, Bruno. You just manually reposition it (the middle curve) using the OSnap with perpendicular activated, you may also use a plane to intersect those lines an keep the position of the endpoints, but this is not mandatory. Hope this helps.
