UE4 – Enable complex collision for models

Software:
Unreal Engine 4.21

By default UE4 uses fast simplified convex collision shapes to calculate collision for static mesh actors.
This means that the player or projectiles wont be able to path through holes, openings or doors in the model.

To set complex (concave) collision for a static mesh model:

In Static Mesh editing window, in the details pane, under Collision:
Set Collision Complexity to: Use Complex Collision As Simple

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This example shows the default behavior for a model that has an opening, neither the projectiles nor the player can pass:

Simple_Collision.gif

In this example collision for the model was set to Use Complex Collision As Simple:

Complex_Collision.gif

 

Sprite Sheet – Storing animation frames in one texture

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An efficient way to store 2D animation for games is to layout all the frames withing one texture called a ‘Sprite Sheet’ or ‘Texture Atlas’.
This saves resources by avoiding multiple texture loading operations and only animating the UVs of the shader to display the needed image at each frame.
Sprite Sheets are also used to pack various states of game graphics and textures for multiple objects in one file.

Creating Sprite-Sheets:
Sprite Sheets can be created manually using any image editing software,
For an automated process and more control, a specialized software like Texture Packer can be used.
And it can also be done automatically in Adobe Animate (Flash).
* There are many more solutions / scripts that will do that you can find on the web…

Creating a Sprite Sheet in Animate

Software:
Animate CC 18

To generate a Sprite Sheet (Texture Atlas) in Animate:

  1. Create a new project.
    * the type of the project doesn’t matter.
  2. Drag all your animation frames from into the Library window in Animate.
  3. Select all the frames in the Library window.
  4. RMB Click the selected frames and choose Generate Sprite Sheet.
  5. In the Generate Sprite Sheet window, set the Sprite Sheet settings, output path and press Export.

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