Part of the toolpath for G3 is not displayed

[iillii]

Versions

• Candle version: 1.1.7, 1.2.13b

PC info

• OS: Windows 10 x64

Describe the bug Part of the toolpath for G3 is not displayed

To Reproduce Code:

G90
G21
M0
G0 Z5.00
G0 X0.00 Y0.00
G0 Z5.00
G0 X0.00 Y9.80
G0 Z1.00
G3 X0.00 Y-9.80 Z0.00 R9.80 F150.00
G3 X0.00 Y9.80 Z-1.00 R9.80 F150.00
G3 X0.00 Y-9.80 R9.80 F300.00
G3 X0.00 Y9.80 R9.80 
G1 X0.00 Y12.40 F300.00
G3 X0.00 Y-12.40 R12.40 F300.00
G3 X0.00 Y12.40 R12.40 
G1 X0.00 Y13.00 F300.00
G3 X0.00 Y-13.00 R13.00 F300.00
G3 X0.00 Y13.00 R13.00 
G0 Z5.00

Lines 9-12 not displayed in toolpath preview.

Сode:

G90
G21
M0
G0 Z5.00
G0 X0.00 Y0.00
G0 Z5.00
G0 X0.00 Y9.80
G0 Z1.00
G3 X0.00 Y-9.80 Z0.00 R9.80 F150.00
G3 X0.00 Y9.80 Z-1.00 R9.80 F150.00
G3 X0.00 Y-9.80 R9.80 F300.00
G3 X0.00 Y9.80 R9.80 
G1 X0.00 Y11.80 F300.00
G3 X0.00 Y-11.80 R11.80 F300.00
G3 X0.00 Y11.80 R11.80 
G1 X0.00 Y13.00 F300.00
G3 X0.00 Y-13.00 R13.00 F300.00
G3 X0.00 Y13.00 R13.00 
G0 Z5.00

Lines 9-12 and lines 14-15 not displayed in toolpath preview.

Additional context But there is no issues with this code:

G90
G21
M0
G0 Z5.00
G0 X0.00 Y0.00
G0 Z5.00
G0 X0.00 Y9.90
G0 Z1.00
G3 X0.00 Y-9.90 Z0.00 R9.90 F150.00
G3 X0.00 Y9.90 Z-1.00 R9.90 F150.00
G3 X0.00 Y-9.90 R9.90 F300.00
G3 X0.00 Y9.90 R9.90 
G1 X0.00 Y12.50 F300.00
G3 X0.00 Y-12.50 R12.50 F300.00
G3 X0.00 Y12.50 R12.50 
G1 X0.00 Y13.00 F300.00
G3 X0.00 Y-13.00 R13.00 F300.00
G3 X0.00 Y13.00 R13.00 
G0 Z5.00

Everything shows correctly

[mar0x]

Hello,

It seems the line 9 G3 X0.00 Y-9.80 Z0.00 R9.80 F150.00 expected to be an arc from (0.0, 9.8, 1.0) to (0.0, -9.8, 0.0).

• the R9.80 is wrong because the distance between two points is sqrt(385.16) = 19.625.. which is bigger than 2*R.
• there is a bug in convertRToCenter() function: z coordinate of center is always 0 (this why the code from "Additional context" shows arcs).
• G2 & G3 with radius specification may work only in single defined plain (XY, XZ or YZ).

So, I would suggest to specify an arc center with I, J, K parameters instead of arc radius R: G3 X0.00 Y-9.80 Z0.00 J-9.8 K-0.5 F150.00.