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Well done keeping up.
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In this lesson you will be introduced
to the sketch environment.
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And don't worry if you don't
remember everything after this lesson,
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we will look more closely at all details
later in the course.
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Your sketch is the geometric profile that
shapes your three dimensional geometry.
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I like to think about sketches
as the underlying assets
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that drive the shapes of your design.
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A sketch is more than just a shape
that creates three dimensional geometry.
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sketch workflows provide you
with an opportunity to work proactively
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with your two dimensional
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and three dimensional designs,
as well as with your entire assembly.
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Later in the course,
we will see examples how sketch
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workflows
improve both efficiency and quality.
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You can create your sketches
on construction planes,
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faces, or at any
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point in the three dimensional space,
and you can utilize
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existing design assets,
such as edges, from other geometry.
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When you make sketches,
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you will recognize tools
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you have used in other CAD software,
such as multiple options
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for creating rectangles,
circles, arcs, splines and more.
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You have two different sketch profiles
in Autodesk Fusion.
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An open
profile does not form a closed boundary.
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We will explore open profiles
later in the course when we extrude
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thin solid features, when we guide
modeling operations such as sweep
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and when we work with surface modeling,
a closed profile forms a closed boundary.
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This closed boundary is easy to spot in
Autodesk Fusion.
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The area has a shaded blue color.
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Closed profiles can be used
when you want to extrude three
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dimensional shapes or perform
Boolean operations, such as cut or join.
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sketches can either be unconstrained,
partially constrained,
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or fully constrained.
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I like to think about constraints
as rules.
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More rules equals less freedom
and just as in life,
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there are times when rules are good,
and there are times when no rules are good
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and the best thing is probably a balance
between
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rules and different degrees of freedom.
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An unconstrained sketch is generally
better early in the design process.
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During this phase,
you want flexibility and freedom.
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You will recognize unconstrained
sketches in your project browser
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when you spot this symbol
next to a sketch,
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and you can move this geometry
around in your design space
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since the sketch isn't fully locked
with dimensions or constraints,
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A constrained
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sketch has geometry that's locked in place
by dimensions and constraints.
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A fully constrained sketch is black.
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Rules.
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For example, dimensions
or constraints, can be useful
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when you know
your desired details about your design.
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You want to avoid surprises
and enjoy predictable results
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when you make changes to your design.
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You should recognize six types of sketch
geometry.
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Default sketch geometry is blue with
shaded blue color for closed profiles.
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Construction
geometry is orange and dashed.
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I like to think about those as help lines
that don't contribute
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to the sketch profile
that drives the three dimensional design
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Centerline geometry is orange and dashed.
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It shows symmetry.
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Projection geometry is purple.
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Those sketch lines are projected
onto the sketch plane
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from existing two dimensional
or three dimensional profiles.
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Fixed geometry is green
and is a sketch locked in place
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with the fixed / unfix constraint
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And finally constrained geometry is black.
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This geometry has so many rules,
for example
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dimensions and constraints,
so it can't move.
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You can make both two dimensional
and three dimensional sketches,
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but you need to activate 3D sketch
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if you don't want your sketch
to be restricted to the selected plane.
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I personally recommend
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two dimensional sketches
most of the time, such as when you intend
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to utilize features such as extrude
and three dimensional sketches
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when you want to create paths with options
such as sweep.
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A contextual tab appears
when you create your sketch
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and you close this contextual tab
when you click Finish Sketch.
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A Protip here.
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You can skip
the Finish Sketch step and jump right
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into 3D modeling commands by pressing 3D
modeling commands such as Extrude. We
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will start from the
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basics with the sketch line
command in the next lesson.
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Good job keeping up.