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UI 1 - Part 1
UI 1
Ui 1 - Part 2
1 Overview
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UI3 Overview
2 Get Started
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Part 1: Generic Meshes On Spline Documentation
A Blueprint that gives you many possibilities to place meshes along a spline.
Content:
- Railings
- Bushes in multiple rows placed with random scale, location and rotation
- A building facade
- The roof of a building made out of 2m x 2m modules
- A row of pillars
- Steps and paths made out of small pieces
Placement Logic
The hierarchy for this blueprint is as follows- Sets - A set extends over the full length of the spline
- Sections - Sets can be split up in Sections
- Placements - Sections can have multiple Placements on top of each other.
- Mesh Sequences - or a single mesh are placed through the Placement logic over the length of the Section.
Sets and Sequences can have copies. A copy would be a direct replication of the Set or Sequence. For example multiple rows of chairs in a theater. All mesh copies are rendered in a single draw call to improve the performance of the scene.
Mesh Sequence
| > Meshes | ||
| > Mesh Sequence | 3 Array elements | A sequence (group) is either a single mesh or a sequence of different meshes that repeat within the placement. |
| > 0 | 2 Array elements | The first sequence (group) of meshes. Can be a single mesh. |
| > Mesh | 1 Array element | The meshes for this sequence |
| > 0 | 7 members | first mesh of this sequence |
| Description | Window 270 | a note for you about this mesh |
| Static Mesh | P_ WinAlu01 ... | Pick a mesh from the browser |
| Amount | 3 | how many meshes will be repeated within the sequence. Here there are 3 windows between each metal pole. |
| > Materials | 1 Array element | Optional list of replacement materials per material id |
| Orientation | 90.0 degrees | Use the drop down menu to align the mesh correctly along the spline |
| Overlap | 0.0 | This will overlap the next mesh instance with the current one. |
| > Mesh Transform | Location Rotation Scale |
This can compensate any misalignements
with the spline Do not use the Z rotation. Use Orientation instead Scale the mesh here. It will effect the placement calculation |
| GroupGap | 15.0 | This makes room for another placement at the end of this mesh sequence. |
Section Sets
| > Sections | ||
| > Section Sets | 2 Array elements | A Set extends over the entire spline. Sections are subdivisions of Sets. |
| > 0 | 6 members | The first set for the spline. You can have multiple sets per spline. |
| SetName | lower windows | Just a note for you. |
| > Set Transform | Location Rotation Scale |
This will transform the Set and all its content relative to the spline. Only location and Scale transforms make senes here. |
| StartOffset | 0.0 | Use this to inset the sets content at the start of the spline |
| EndOffset | 0.0 | a note for you about this mesh |
| > Sections | 1 Array element | Add sections here. See next chapter. |
| > SetCopies | 1 Array element | Copies of the entire set. You can have multiple arrays of copies here |
| > 0 | 2 members | The first set of copies |
| Copies X | 0 | How many copies you want. Location offset will be incremental for each copy. |
| > Location Offset | X Y Z | Incremental offset for the set copies. |
Sections
| > Sections | 1 Array elements | A Set extends over the entire spline. Sections are subdivisions of Sets. |
| > 0 | 7 members | The first section of the set. |
| SectionName | Just a note for you. | |
| Section Distance Type | Fill Remaining | The section will grab a part of the remaining unfixed space based on the SectionDistance |
| Fixed Distance | A fixed distance given as Section Distance. | |
| From Placements | The section size will be set to the largest placement's size of this section. | |
| Fixed Gap | A fixed empty gap. Remove all placements from this secion to make this work. | |
| Section Distance | 100.0 | A fixed distance or the relative distance for section set to fill the space. |
| Section End Offset | 0.0 | Will offset the next section effectively making this section shorter. |
| > Section Transform | Location Rotation Scale |
This will transform the Section and all its content relative to the spline. Only location and scale transforms make sense here. |
| > Placements | 2 Array element | Add Placements here. See next chapter. |
| > Section Copies | 1 Array element | Copies of the entire set. You can have multiple arrays of copies here |
| > 0 | 2 members | The first set of Section copies |
| Copies X | 0 | How many copies you want. Location offset will be incremental for each copy. |
| > Location Offset | X Y Z | Incremental offset for the Section copies. |
Placement
| > Placements | 2 Array elements | Placements of meshes or sequences for the current Section. |
| > 0 | 10 members | The first Placement of the set. Placements are put 'on top' of each other. |
| Mesh Group ID | 0 | The ID of the Mesh or Mesh Sequence you have set up in the Meshes section. |
| Rotation Mode | Look at next instance | The mesh will line up with the next instance along the spline |
| Spline rotation | The mesh will be rotated like the spline rotation. Use for poles. | |
| Default | The rotation set in the Mesh Sequence transform | |
| Placement Mode | Fill and stretch | The Section will be filled with the closest number that fits and then all meshes will be stretched to fit exactly. |
| Fill but don't stretch | The Section will be filled with the closest number leaving a gap at the end | |
| Fill with amount stretched | The Section will be filled with a given amount and the meshes will be stretched to fit exactly. | |
| Fill with amount | Add a given amount equally spread over the Section. For poles, trees etc. | |
| Manual | Add a given amount of meshes and leave the rest empty. | |
| From Placement ID | Use the logic of another Placement ID | |
| Spline Mesh | Use a spline mesh that can bend along the spline. The mesh will need extra sub divisions to be bend. The Spline will need extra spline points for a smooth curve. | |
| From Placement ID | 0 | The ID of another Placement used for the current Placement's logic. |
| Amount Of Instances | 1 | Amount for manual placements (excluding the end point) |
| Place On Start Point | true | The first mesh will be placed |
| Place On End Point | false | A final mesh will be placed at the end of the section. Good for poles or trees, etc. |
| Use Random | false | If true every mesh (group) will be randomly transformed with below values. |
| > Random Transform | Location Rotation Scale |
This wil randomly transform every instance. For example a location offset X=20 will transform a random value between -10 and +10. |
| > Incremental Offset | X Y Z | Incremental offset for the Placement copies. |
[fixed] Crash in 4.26 while copying spline
[Fixed Feb 2021] Update to the latest version to fix this issue.In version 4.26.0 of the editor duplicating or copy/pasting this blueprint will crash the editor. Here is an easy fix you can do to avoid this crash:
- Double click the BP_GenericMeshesOnSpline to open it.
- Find the variable ActualDistance
- Click on the bin icon to remove the default values.
- Find the variable ActualStartPoint
- Click on the bin icon to remove the default values.
- Compile the blueprint
- Save the blueprint
Now you should be able to copy and paste this blueprint.
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