Civil engineering feature implementation (Transportation Engineering)

[Joel_graff]

Do you typically connect to circular curves directly with a spiral?

[HakanSeven12]

Do you typically connect to circular curves directly with a spiral?

I think you talking about that. It comes from previous arc radius and connecting to next arc radius.

Code: Select all

				<Curve rot="cw" chord="1982.471830835185" crvType="arc" delta="44.821592613698" dirEnd="88.913727421587" dirStart="133.735320035285" external="212.409440035043" length="2033.939354671531" midOrd="196.367049631561" radius="2600.000000281714" tangent="1072.215863769001">
					<Start>4289508.380882925354 498833.846224466339</Start>
					<Center>4291305.833562298678 500712.453119715734</Center>
					<End>4291355.124095283449 498112.92038385279</End>
					<PI>4290283.100927023217 498092.593425624247</PI>
				</Curve>
				<Spiral length="119.5604434" radiusEnd="1749.99999925989" radiusStart="2600.000000281906" rot="cw" spiType="clothoid" theta="3.274598165011" totalY="3.193225983252" totalX="119.501474579495" tanLong="63.690314384002" tanShort="55.902435497454">
					<Start>4291355.124095283449 498112.920383852615</Start>
					<PI>4291418.802963429131 498114.127818291716</PI>
					<End>4291474.543556556106 498118.378532640869</End>
				</Spiral>
				<Curve rot="cw" chord="489.372289282862" crvType="arc" delta="16.074936823812" dirEnd="69.564192432764" dirStart="85.639129256577" external="17.361061370264" length="490.981005387155" midOrd="17.190520976104" radius="1749.999999259861" tangent="247.113579598785">
					<Start>4291474.543556556106 498118.378532640869</Start>
					<Center>4291341.476901379414 499863.312131002021</Center>
					<End>4291952.502951218747 498223.450196622347</End>
					<PI>4291720.941721033305 498137.168576926517</PI>
				</Curve>

I never use a spiral like that. That alignments coming from design office.

[Joel_graff]

I never use a spiral like that. That alignments coming from design office.

Ok. I guess I'm trying to determine what the use cases are for that. I might be able to implement a general solution to accommodate those, but I don't know if I can. It looks difficult.

At very least, spiral support is in place for standard clothoids (tangent - spiral - arc - spiral - tangent).

Dev branch is updated.

[HakanSeven12]

At very least, spiral support is in place for standard clothoids (tangent - spiral - arc - spiral - tangent).

Dev branch is updated.

Is it support spiral-arc-spiral-spiral-arc-spiral? I will test it after 3 or 4 days later

[Joel_graff]

Is it support spiral-arc-spiral-spiral-arc-spiral? I will test it after 3 or 4 days later

Yes, but only if the adjacent spirals have infinite radius at the connecting ends (as though they were connected to lines).

The solution for spirals with two non-infinite radii looks achievable, but it's more math than I'm normally used to.

[HakanSeven12]

The solution for spirals with two non-infinite radii looks achievable, but it's more math than I'm normally used to.

I hope you can find a way for it

[Joel_graff]

Yeah... no promises. I was hoping I could just ignore that for some time.

[HakanSeven12]

Looks wierd Also you need to rename freecad.trails/freecad/trails/geometry/Spiral.py in lowercase

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menemenC3D.png (133.93 KiB) Viewed 948 times

[Joel_graff]

Looks wierd Also you need to rename freecad.trails/freecad/trails/geometry/Spiral.py in lowercase

Hmm.. Yeah. It does seem a bit.. off.

I did actually rename it to lowercase, but since I'm currently working in it, I haven't committed anything yet.

I think I've figured out the mathematical model for generating clothoids with two radii... I think. No idea how long it'll take to implement, though.

Anyway, I'll try to take a closer look at your file. At least it's interesting to look at.

[Joel_graff]

Getting closer...

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