Blend

Hi, I have problem to create a simple blend like a pyramid, in which number
of vertex of second section is not the same of the second one. Can you help
me?

 

: Hi, I have problem to create a simple blend like a pyramid, in which number
: of vertex of second section is not the same of the second one. Can you help
: me?
:
Attilio:
You will be blending to a point as your second or last section. After you've
togged the section ('Sketch>Feature tools>Toggle Section'), you can create a
sketcher point. In the same menu with 'Toggle section' is another feature tool
called 'Blend vertex'. You can use this to blend 2 or more vertices to a single
one.

David Janes

 

You can use 'divide' in geom tools to break entities into more elements so
you have the same number in each section, or, if the sections are 'smooth'
(consist entirely of tangent entities) you can create approximate composite
curves through them, which only have 1 element, although you have to make
sure the start point and direction of each one is somewhere comparible or
your resulting sections will look like a corkscrew on acid.

 

I try to do it, but when I choose "parallel section" it says that "number of
entities must be equals" and when I choose "general section" the section
Feature Tools is not active.
It's so difficult to create a pyramid?
Thank you for your attention.

 

: I try to do it, but when I choose "parallel section" it says that "number of
: entities must be equals" and when I choose "general section" the section
: Feature Tools is not active.
: It's so difficult to create a pyramid?

No, only when your 'instructor' fucks you up. My apologies. No 'blend vertex' in
this case. So, the correct way to create a pyramid:

Create a Blend, Parallel blend, regular section, sketch section, okay. Sketch the
square for the first section. Go to 'Feature tools' and Toggle section. Sketch the
point. Done sketch. Then it wants to know the distance between sections (height of
pyramid); give it a number or accept the default. Done and ta dah, there's your
pyramid. You can always blend to a point when it is the only geometry in your last
section. This also works with a swept blend. Blend vertex is for those situations
where you wish to blend 5 sides to 4 sides to 3 sides, etc. Two vertices of the 5
sided figure must blend to a single vertex of the 4 sided figure which is the
blend vertex. Same with 4 to 3.

David Janes

 

That's OK, now it's clear.
And if I wish to create a second section with a line, like a roof ?

 

: That's OK, now it's clear.
: And if I wish to create a second section with a line, like a roof ?
:
You can add many sections between the first square section and the point to which
the four sides blend ~ larger sections, smaller sections, polygonal sections,
spline geometry sections. The only condition is that sections after the first have
the same number of vertices. So, as I mentioned before, if you go from a section
with a larger number of vertices to one with a smaller number of vertices, you
must do as John Wade's message suggested ~ break the geometry some place to add a
vertex. If you are blending to a section with a larger number of vertices, you
must use the 'Blend vertex' to get the number of vertices to agree from one
section to the next, the last being the section with the single point. The last
condition of successful blends is that the start points somewhat line up since the
first operation in creating the blend is to connect the start points (the zero
points) of each section and then, to connect the subsequent points numbered, in
each section, as 1,2,3, etc. If the 'Straight' type was selected, straight lines
are drawn, from section to section, connecting like numbered points. If the
'Smooth' type was selected, splines are drawn. Using these lines, section geometry
is blended.

David Janes