Object.to_mesh() does not apply modifier if the object is disabled from the viewport #71556

New Issue

Ryan Guy · 2019-11-13T21:07:10+01:00

Ryan Guy commented

2019-11-13 21:07:10 +01:00

System Information
Operating system: Windows 10 Home
Graphics card: GTX 1070 8GB

Blender Version
Broken: 2.81 beta, 1252577580, 2019-11-12
Worked: (optional)

Short description of error

I want to use the Python API to export an object mesh as a triangle mesh. I am doing this by adding a triangulate modifier to the object. When using to_mesh(), the modifier is not applied when the object is disabled in the viewport (Globally disable in viewports).

Here is a script that reproduces the issue

import bpy

cube_object = bpy.data.objects.get("Cube")
triangulation_mod = cube_object.modifiers.new("triangulate", "TRIANGULATE")

depsgraph = bpy.context.evaluated_depsgraph_get()
obj_eval = cube_object.evaluated_get(depsgraph)
to_mesh_result = obj_eval.to_mesh()

print("Number of faces:", len(to_mesh_result.polygons))

cube_object.modifiers.remove(triangulation_mod)

Here is the output when the Cube object is disabled in the viewport:

Number of faces: 6

Here is the output when the Cube object is enabled in the viewport:

Number of faces: 12

This only seems to happen when using the Disable in Viewports icon. The Hide in Viewport icon does not reproduce the issue.

Exact steps for others to reproduce the error

I have attached a .blend file that contains the above script: to_mesh_bug.blend

Open .blend file
Press 'Run Script'
View console output

The number of faces is 6 when the Cube is disabled in viewports and 12 when enabled.

**System Information** Operating system: Windows 10 Home Graphics card: GTX 1070 8GB **Blender Version** Broken: 2.81 beta, 125257758007, 2019-11-12 Worked: (optional) **Short description of error** I want to use the Python API to export an object mesh as a triangle mesh. I am doing this by adding a triangulate modifier to the object. When using to_mesh(), the modifier is not applied when the object is disabled in the viewport (Globally disable in viewports). Here is a script that reproduces the issue ``` import bpy cube_object = bpy.data.objects.get("Cube") triangulation_mod = cube_object.modifiers.new("triangulate", "TRIANGULATE") depsgraph = bpy.context.evaluated_depsgraph_get() obj_eval = cube_object.evaluated_get(depsgraph) to_mesh_result = obj_eval.to_mesh() print("Number of faces:", len(to_mesh_result.polygons)) cube_object.modifiers.remove(triangulation_mod) ``` Here is the output when the Cube object is disabled in the viewport: ``` Number of faces: 6 ``` Here is the output when the Cube object is enabled in the viewport: ``` Number of faces: 12 ``` This only seems to happen when using the Disable in Viewports icon. The Hide in Viewport icon does not reproduce the issue. **Exact steps for others to reproduce the error** I have attached a .blend file that contains the above script: [to_mesh_bug.blend](https://archive.blender.org/developer/F8064142/to_mesh_bug.blend) 1. Open .blend file 2. Press 'Run Script' 3. View console output The number of faces is 6 when the Cube is disabled in viewports and 12 when enabled.

Ryan Guy commented

2019-11-13 21:07:10 +01:00

Added subscriber: @rlguy

Philipp Oeser commented

2020-01-08 19:40:20 +01:00

Added subscriber: @lichtwerk

Philipp Oeser commented

2020-01-08 19:40:20 +01:00

Changed status from 'Needs Triage' to: 'Archived'

Philipp Oeser closed this issue

2020-01-08 19:40:20 +01:00

Philipp Oeser self-assigned this 2020-01-08 19:40:20 +01:00

Philipp Oeser commented

2020-01-08 19:40:20 +01:00

Hi and thx for the report! (sorry it took a while to answer...)

If I am not mistaken, objects that are globally disabled from viewports also are excluded from the depsgraph, yes.
This way their modifiers are not executed, gaining back performance; you end up with the "original" object.

This is true for all exporters (OBJ, FBX, ...) and is more or less by design.

Afraid we have to close this report (feel free though to comment again if issues persist...)

Hi and thx for the report! (sorry it took a while to answer...) If I am not mistaken, objects that are globally disabled from viewports also are excluded from the depsgraph, yes. This way their modifiers are not executed, gaining back performance; you end up with the "original" object. This is true for all exporters (OBJ, FBX, ...) and is more or less by design. Afraid we have to close this report (feel free though to comment again if issues persist...)

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Object.to_mesh() does not apply modifier if the object is disabled from the viewport #71556