Custom Actor Shader
When rendering most of the actors (characters and backgrounds, except generic ones) a special shader is used to handle semi-transparency overdraw and support various transition effects.
You can override the default shader by assigning a custom one to
Custom Texture Shader property available in the actor configuration menu.
Be aware, that the shader is expected to have specific properties; check default shader
Naninovel/Resources/Naninovel/Shaders/TransitionalTexture for a reference.
When actor is represented as a sprite on a scene,
Custom Sprite Shader property is available (the case for non-generic implementations when they're not rendered to texture). By default, a simple unlit transparent shader is used; in case you want to implement lighting or surface effects, assign a custom shader to the property.