Curve's calc_curve() not playing along with hook modifier #81091

New Issue

Élie Michel · 2020-09-23T14:44:56+02:00

Élie Michel commented

2020-09-23 14:44:56 +02:00

System Information
Operating system: Windows
Graphics card: RTX2080

Blender Version
Broken: 2.90

Short description of error
The calc_curve() function does not take Hook modifiers into account.

Exact steps for others to reproduce the error
Add Curve;
Hook a new object Empty to one of its control points;
Measure it's computed length: C.active_object.data.splines- [x].calc_length();
Move the Empty object around so that it changes the length of the curve;
Measure the computed length again.

Observed: Both values are the same and corresponds to the length of the curve prior to the modifier.
Expected: Two different length values.

**System Information** Operating system: Windows Graphics card: RTX2080 **Blender Version** Broken: 2.90 **Short description of error** The calc_curve() function does not take Hook modifiers into account. **Exact steps for others to reproduce the error** Add Curve; Hook a new object Empty to one of its control points; Measure it's computed length: C.active_object.data.splines- [x].calc_length(); Move the Empty object around so that it changes the length of the curve; Measure the computed length again. **Observed:** Both values are the same and corresponds to the length of the curve prior to the modifier. **Expected:** Two different length values.

Élie Michel commented

2020-09-23 14:44:56 +02:00

Added subscriber: @elie

Philipp Oeser commented

2020-09-23 15:05:06 +02:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-09-23 15:05:06 +02:00

This issue has come up before, see #65152 (Curve Length and Converted Mesh Length Mismatch) or #72025 (length of the spline does not work after apllying hooks).

Please have a peak in those reports regarding possible workarounds (none of them are painless tbh.).

But afraid this is not considered a bug atm... will merge into #72025.

This issue has come up before, see #65152 (Curve Length and Converted Mesh Length Mismatch) or #72025 (length of the spline does not work after apllying hooks). Please have a peak in those reports regarding possible workarounds (none of them are painless tbh.). But afraid this is not considered a bug atm... will merge into #72025.

Philipp Oeser commented

2020-09-23 15:05:17 +02:00

Closed as duplicate of #72025

Philipp Oeser closed this issue

2020-09-23 15:05:17 +02:00

Élie Michel commented

2020-09-24 12:59:05 +02:00

Sorry for the duplication, and thanks for the pointers!

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Curve's calc_curve() not playing along with hook modifier #81091