GPencil: Array Modifier does not apply occlusion correctly #68818

New Issue

David Butterworth · 2019-08-19T11:38:26+02:00

David Butterworth commented

2019-08-19 11:38:26 +02:00

System Information
Operating system: Windows 10
Graphics card: NVIDIA GTX 750Ti

Blender Version
Broken: ( 2.80, as found on the splash screen ) installed from "blender-2.80-windows64.msi"
Worked: works but has this defect

Subject : "Array" option of "Add Grease Pencil Modifier" in Blender 2.80

Defect : does not apply occlusion correctly to array instances of object

An "incorrect array object" is formed by

building array of each layer in the object, then
building the modified object by stacking the layered outputs produced by 1)

The "correct object" is formed by

building each array instance by stacking its layers
using occlusion rules to determine the parts of each array memeber that is visible

Notes:

A youtube video renders the "correct array object" (but does not use Blender 2.80)

  Refer Youtube tutorial . . .

Learn Grease Pencil 2D Animation in Blender 2.8 Alpha 2
https://www.youtube.com/watch?v=pywbPQD9vYU

at 11:20 in 16:37 minutes

my install of Blender 2.80 renders the "incorrect array object"

   {F7672775}

   {F7672777}

No one has commented on Youtube tutorial that Blender 2.80 renders the "incorrect array object"
I downloaded the demo file "(Anim) grease_pencil_basics_tutorial.blend"

 It contained assets as per Youtube tutorial but did not contain any usage of the 
 "Array" option of "Add Grease Pencil Modifier" 
 So I applied that option on the downloaded asset and obtained the incorrect "incorrect array object"

Conclusion:
I would like to get the "Array" option result shown in the Youtube tutorial
rather than the result produced by my usage of Blender 2.80

**System Information** Operating system: Windows 10 Graphics card: NVIDIA GTX 750Ti **Blender Version** Broken: ( 2.80, as found on the splash screen ) installed from "blender-2.80-windows64.msi" Worked: works but has this defect **Subject : "Array" option of "Add Grease Pencil Modifier" in Blender 2.80** **Defect : does not apply occlusion correctly to array instances of object** An "incorrect array object" is formed by 1) building array of each layer in the object, then 2) building the modified object by stacking the layered outputs produced by 1) The "correct object" is formed by 1) building each array instance by stacking its layers 2) using occlusion rules to determine the parts of each array memeber that is visible Notes: 1) A youtube video renders the "correct array object" (but does not use Blender 2.80) ``` Refer Youtube tutorial . . . ``` Learn Grease Pencil 2D Animation in Blender 2.8 Alpha 2 https://www.youtube.com/watch?v=pywbPQD9vYU at 11:20 in 16:37 minutes 2) my install of Blender 2.80 renders the "incorrect array object" ``` {F7672775} ``` ``` {F7672777} ``` 3) No one has commented on Youtube tutorial that Blender 2.80 renders the "incorrect array object" 4) I downloaded the demo file "(Anim) grease_pencil_basics_tutorial.blend" ``` It contained assets as per Youtube tutorial but did not contain any usage of the "Array" option of "Add Grease Pencil Modifier" So I applied that option on the downloaded asset and obtained the incorrect "incorrect array object" ``` Conclusion: I would like to get the "Array" option result shown in the Youtube tutorial rather than the result produced by my usage of Blender 2.80

David Butterworth commented

2019-08-19 11:38:26 +02:00

Added subscriber: @Frappe

Antonio Vazquez commented

2019-08-19 13:55:15 +02:00

Added subscriber: @antoniov

Antonio Vazquez commented

2019-08-19 13:55:15 +02:00

By design, the array works by Layer, so each layer is created one by one for all array elements. As the drawing order is defined by Layer position, you can get this problems. To fix it, just put all drawing in one layer only (this is required to get good result with array).

For example, using 2 layers:

And, now, using the merge operator to get all adrawings in the same layer:

As we are working in a 3D space, get the layers working as "2D" need some tricks, and this makes impossible to get what you want with several layers.

By design, the array works by Layer, so each layer is created one by one for all array elements. As the drawing order is defined by Layer position, you can get this problems. To fix it, just put all drawing in one layer only (this is required to get good result with array). For example, using 2 layers: ![image.png](https://archive.blender.org/developer/F7672967/image.png) And, now, using the merge operator to get all adrawings in the same layer: ![image.png](https://archive.blender.org/developer/F7672970/image.png) As we are working in a 3D space, get the layers working as "2D" need some tricks, and this makes impossible to get what you want with several layers.

Antonio Vazquez self-assigned this 2019-08-19 13:55:29 +02:00

Antonio Vazquez changed title from ~~"Array" option of "Add Grease Pencil Modifier" in Blender 2.80 does not apply occlusion correctly~~ to GPencil: Array Modifier does not apply occlusion correctly

2019-08-19 13:57:23 +02:00

Antonio Vazquez was unassigned by Dalai Felinto

2019-12-23 13:54:37 +01:00

Antonio Vazquez commented

2019-12-23 18:13:44 +01:00

Changed status from 'Confirmed' to: 'Archived'

Antonio Vazquez closed this issue

2019-12-23 18:13:44 +01:00

Antonio Vazquez self-assigned this 2019-12-23 18:13:44 +01:00

Antonio Vazquez commented

2019-12-23 18:14:22 +01:00

More than a week without any user feedback and also this is not a bug, but a feature request.

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GPencil: Array Modifier does not apply occlusion correctly #68818