Turn Splines into Cards

Curve objects are the most convenient way to use this tool; after adding a modifier, it turns all splines into brush cards:

blender_jEgYTiMiWg.mp4

Add SB_Spline Brush tool. Drag and Drop from asset library or add in modifier stack*(Shift+A)*. In Material | UV tab of modifier assign custom material and UV_Layout object on it.

Draw splines in curve Edit Mode.

Draw Clip.mp4

Make sure you linked surface to make brush strokes auto-aligned to the surface normal. There is an Object or Collection method to pick surfaces.

Parameters

Surface Normals

• Smooth Normal -Alignment of cards by flat or smooth surface normal
• Normal Offset -Offset of splines based on surface normal
• Offset Randomness -Randomize offset per spline
• Offset threshold -Minimum distance to offset
• Normal Offset Factor -Black and White Texture mask to influence normal offset based on Surface UV map

Surface

• Surface Object\Collection picker -link mesh surfaces for cards alignment and attribute transferring.
• Surface UV -UV map of surfaces to sample textures and UV attribute on cards
• Shrinkwrap -Wrap Cards on nearest mesh surface
• Shrinkwrap Offset -Preserve Initial Offset of spline based on its distance from nearest surface
• Split Seams -Splits Splines on Surface UV for correct wrapping of sampled Surface UV Map
• Clamp With Surface -Clamp splines inside mesh and by backfaces

Splines

• Curves Object\Collection picker -link splines from object or collection instead of input geometry.
• Radius -Global radius multiplier
• Relax parameters -Radius\Normal\Curves relaxing for smoother interpolations
• Resample Curves\Profile -Resolution of cards geometry.
• Extend Start\End -Extend curve EndPoints until it hits the surface.
• Extension Factor -Black and White Texture mask to influence Extend based on Surface UV map

Guided Scattering

• Length\Radius Density -Controls density of splines distribution along Lenght\Radius
• Cards Length\Radius -Multiplier of cards Length\Radius.
• Length\Radius Randomness -Randomize Length\Radius multipliers
• Tilt Deviation -Random tilting per spline
• Seed \ Seed per Frame -Seed of randomness parameters

Material | UV

• Material -Cards Material
• UV Layout -UV Mapping object
• Seed \ Seed per Frame -Seed of UV Layout mapping distribution
• Pack UV -Store packed UV of cards in additional attribute.

Surface Image Textures

• Surface Textures -Sample Image texture from surface. Based on "Surface UV" attribute
• Surface Image Blur -Blur sampled texture color.

Camera

Camera Space related parameters accessible in Spline Brush Cards modifier. The reason: attributes storing and optimization.

• Camera -Camera Object
• Use Active Camera -Use Active Scene camera instead of Camera Object
• Camera Space Projection -Project Current Cards into camera space, if Camera Space modifier attached

For more info check YouTube tutorial.