How would you go about this kind of blend out on a G3 surface such as a bulge on a car bonnet/hood which needs to blend seamlessly into the forward surface? Thanks for the great videos by the way!
I was trying to do a bonnet/hood from Aston Martin DB9. I have a solution but it's not perfect (G3 all boundaries). divided and trimmed the face at the side faces of the bulge, then used studio surface. My background is mostly solid modelling so working with surfaces takes a bit of getting used to! Thanks for your time, I'll send you some info.
I saw you wanted to have G2 on the Bridge Curve. If so, and you don't want to modify the curve shape, wouldn't the Curve on Surface be a better option? It can do up to G2.
In a lot of cases G1 is acceptable and with the shape controls if offers it does a really good job. Curve on surface does not give you that shape control so easily.
Yes sir. You will have slightly different results and in most cases you will not notice it. The way the system determines the continuity, mathematically, is what varies. Check reflections. curve mesh may give you a better result so sometimes I try both.
Thanks for the quick response. I've been a UG user since v13, pretty much every version. On NX11 now. tool, fixture and dies. Always looking and learning new ways to tackle a problem.
I have a part with a transition, which I want to blend out on both sides. This method works well on both sides, although on one side I had to use a workaround for the bridge curve and I do not know why. When I select the curves used for bridge curve and select the points, the bridge curve does not go through the point where the blend and the flat surface intersect. I can select 'by arc length' to constrain the bridge curve approximately to the point and the curve looks good, but as soon as I select the point again, the bridge curve seems to ignore the point. It is rather goes through the end point of the edge of the blend surface... I had to trim the blend first and select the edge afterwards, this works. But I stillt don't understand why this happens, do you know why?
Good point, but I checked it before. The correct point is definitly selected and highlighted in the model, but the bridge curve starts from the endpoint of the edge. When I select point on edge and select a point by hand, the bridge curve works correct. But nevertheless, with this little tweak the transition looks great.
I have some doubt this is really a class A method for all cases - something tells me that the studio surface can't possibly make a perfect transition to the other face blend because it doesn't know it itself should create a bit of a blend (a slight curvature toward the curvature of the studio surface) at the point where both blends meet (the sharp triangle corner where you created the interesction point). This would be especially true for smaller faceblend radiuses. I guess should have showed analysis at the end.
Small note that Bridge Curve now goes up to G3 in NX1953+ :)
How would you go about this kind of blend out on a G3 surface such as a bulge on a car bonnet/hood which needs to blend seamlessly into the forward surface?
Thanks for the great videos by the way!
Bob, can you send a pic or a part?
info@classasurfacing.com
I was trying to do a bonnet/hood from Aston Martin DB9. I have a solution but it's not perfect (G3 all boundaries). divided and trimmed the face at the side faces of the bulge, then used studio surface. My background is mostly solid modelling so working with surfaces takes a bit of getting used to! Thanks for your time, I'll send you some info.
I saw you wanted to have G2 on the Bridge Curve. If so, and you don't want to modify the curve shape, wouldn't the Curve on Surface be a better option? It can do up to G2.
In a lot of cases G1 is acceptable and with the shape controls if offers it does a really good job. Curve on surface does not give you that shape control so easily.
Nice.
Would a through curve mesh work as opposed to a studio surface?
Yes sir. You will have slightly different results and in most cases you will not notice it. The way the system determines the continuity, mathematically, is what varies.
Check reflections. curve mesh may give you a better result so sometimes I try both.
Thanks for the quick response. I've been a UG user since v13, pretty much every version. On NX11 now.
tool, fixture and dies. Always looking and learning new ways to tackle a problem.
Glad to help.
Let me know if you want to see anything on the modeling side.
I have a part with a transition, which I want to blend out on both sides. This method works well on both sides, although on one side I had to use a workaround for the bridge curve and I do not know why.
When I select the curves used for bridge curve and select the points, the bridge curve does not go through the point where the blend and the flat surface intersect. I can select 'by arc length' to constrain the bridge curve approximately to the point and the curve looks good, but as soon as I select the point again, the bridge curve seems to ignore the point. It is rather goes through the end point of the edge of the blend surface...
I had to trim the blend first and select the edge afterwards, this works.
But I stillt don't understand why this happens, do you know why?
Did you check your selection intent rules? They may be set to select end point and not existing point.
Good point, but I checked it before. The correct point is definitly selected and highlighted in the model, but the bridge curve starts from the endpoint of the edge. When I select point on edge and select a point by hand, the bridge curve works correct.
But nevertheless, with this little tweak the transition looks great.
I have some selection bugs as well. I think it needs a little tweaking but for the most part it works great.
I have some doubt this is really a class A method for all cases - something tells me that the studio surface can't possibly make a perfect transition to the other face blend because it doesn't know it itself should create a bit of a blend (a slight curvature toward the curvature of the studio surface) at the point where both blends meet (the sharp triangle corner where you created the interesction point). This would be especially true for smaller faceblend radiuses. I guess should have showed analysis at the end.