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Rounded Prism Fixes

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Richard Milewski 2024-02-09 17:32:12 -08:00
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tutorials/Rounding the Cube.md
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@ -263,7 +263,7 @@ You can construct cube-like objects, as well as a variety of other prisms using
A feature unique to [rounded_prism()](https://github.com/BelfrySCAD/BOSL2/wiki/rounding.scad#functionmodule-rounded_prism) is that it uses continuous curvature rounding. Rather than using constant radius arcs, continuous curvature rounding uses 4th-order Bezier curves. For complete details on how this works see [Types of Roundovers](https://github.com/BelfrySCAD/BOSL2/wiki/rounding.scad#section-types-of-roundovers). A feature unique to [rounded_prism()](https://github.com/BelfrySCAD/BOSL2/wiki/rounding.scad#functionmodule-rounded_prism) is that it uses continuous curvature rounding. Rather than using constant radius arcs, continuous curvature rounding uses 4th-order Bezier curves. For complete details on how this works see [Types of Roundovers](https://github.com/BelfrySCAD/BOSL2/wiki/rounding.scad#section-types-of-roundovers).
Two parameters control the roundover k and joint. The joint parameter is the distance from where the rounding starts to the unrounded edge. The k parameter ranges from 0 to 1 with a default of 0.5. Larger values give a more abrupt transition and smaller ones a more gradual transition. Two parameters control the roundover, k and joint. The joint parameter is the distance from where the rounding starts to the unrounded edge. The k parameter ranges from 0 to 1 with a default of 0.5. Larger values give a more abrupt transition and smaller ones a more gradual transition.
Parameters of a "smooth" roundover, with k=0.75. Parameters of a "smooth" roundover, with k=0.75.
@ -276,33 +276,33 @@ Parameters of a "smooth" roundover, with k=0.15. The transition is so gradual th
The joint parameter is specified separately for the top, bottom and side edges; joint\_top, joint\_bot, and joint_sides. The joint parameter is specified separately for the top, bottom and side edges; joint\_top, joint\_bot, and joint_sides.
If you want a very smooth roundover, set the joint parameter as large as possible and then adjust the k value down low enough to achieve a sufficiently large roundover. If you want a very smooth roundover, set the joint parameter as large as possible and then adjust the k value down low enough to achieve a sufficiently large roundover. Joint parameters usually need to be < side/2.
```openscad-3D ```openscad-3D
include <BOSL2/std.scad> include <BOSL2/std.scad>
include <BOSL2/rounding.scad> include <BOSL2/rounding.scad>
rounded_prism(rect(20), height=20, rounded_prism(rect(20), height=20,
joint_top=10, joint_bot=10, joint_sides=10, k = 0.5); joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.5);
``` ```
Here we're using the same cube size of 20, setting the joint paramater to 10 and varying the k parameter. Here we're using the same cube size and joint sizes, but varying the k parameter.
```openscad-3D;ImgOnly NoScales Med VPD=170 VPR=[75,0,25] ```openscad-3D;ImgOnly NoScales Med VPD=170 VPR=[75,0,25]
include <BOSL2/std.scad> include <BOSL2/std.scad>
include <BOSL2/rounding.scad> include <BOSL2/rounding.scad>
left(30) { left(30) {
rounded_prism(rect(20), height=20, joint_top=10, joint_bot=10, joint_sides=10, k = 0.15); rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.15);
move([0,-12,-12]) xrot(90) color("black") text3d("k=0.15", size=3, h = 0.01, anchor= CENTER); move([0,-12,-12]) xrot(90) color("black") text3d("k=0.15", size=3, h = 0.01, anchor= CENTER);
} }
right(0){ right(0){
rounded_prism(rect(20), height=20, joint_top=10, joint_bot=10, joint_sides=10, k = 0.5); rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.5);
move([0,-12,-12]) xrot(90) color("black") text3d("k=0.5", size=3, h = 0.01, anchor= CENTER); move([0,-12,-12]) xrot(90) color("black") text3d("k=0.5", size=3, h = 0.01, anchor= CENTER);
} }
right(30){ right(30){
rounded_prism(rect(20), height=20, joint_top=10, joint_bot=10, joint_sides=10, k = 0.75); rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.75);
move([0,-12,-12]) xrot(90) color("black") text3d("k=0.75", size=3, h = 0.01, anchor= CENTER); move([0,-12,-12]) xrot(90) color("black") text3d("k=0.75", size=3, h = 0.01, anchor= CENTER);
} }
``` ```
@ -330,15 +330,36 @@ right(30){
You can match the cicrular roundover of cuboid() by setting the joint values to the rounding used in cuboid() and setting the k value to 0.93: You can match the cicrular roundover of cuboid() by setting the joint values to the rounding used in cuboid() and setting the k value to 0.93:
```openscad-3D: Med ```openscad-3D: Med, VPR=[75,0,25], VPD=180
include <BOSL2/std.scad> include <BOSL2/std.scad>
include <BOSL2/rounding.scad> include <BOSL2/rounding.scad>
rounded_prism(rect(20), height=20, left(15)
joint_top=4, joint_bot=4, joint_sides=4, k = 0.93); rounded_prism(rect(20), height=20, joint_top=4, joint_bot=4, joint_sides=4, k = 0.93);
right(30) right(15)
cuboid(20, rounding = 4, $fn = 72); cuboid(20, rounding = 4, $fn = 72);
``` ```
Unlike other cube-like objects, the rounded prism smoothness is not affected by the special variable $fn, but by the splinesteps argument. Splinesteps defaults to 16.
```openscad-3D;ImgOnly NoScales, Med, VPD=170, VPR=[75,0,45]
include <BOSL2/std.scad>
include <BOSL2/rounding.scad>
left(35) {
rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.5, splinesteps = 4 )
move([0,-12,-12]) xrot(90) color("black") text3d("splinesteps=4", size=3, h = 0.01, anchor= CENTER);
}
right(0){
rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.5, splinesteps = 16)
move([0,-12,-12]) xrot(90) color("black") text3d("splinesteps=16", size=3, h = 0.01, anchor= CENTER);
}
right(35){
rounded_prism(rect(20), height=20, joint_top=9.99, joint_bot=9.99, joint_sides=9.99, k = 0.5, splinesteps = 64)
move([0,-12,-12]) xrot(90) color("black") text3d("splinesteps=64", size=3, h = 0.01, anchor= CENTER);
}
```
The joint size can be set to different values for each side of the prism: The joint size can be set to different values for each side of the prism:
```openscad-3D ```openscad-3D