niagara-emitters

name	niagara-emitters
display_name	Niagara Emitters
description	Niagara emitter color/curve authoring (tint, hue-shift, ColorFromCurve keys), rapid-iteration parameter tuning, and Custom-HLSL scratch-pad authoring (NiagaraEmitterService + NiagaraScratchPadService). Module/renderer CRUD is owned by the engine NiagaraToolsets. Use when the user asks to recolor or hue-shift particles, edit color curves, tune emitter params, or build a scratch-pad/Custom HLSL module. For system-level lifecycle, load niagara-systems.
vibeue_classes	["NiagaraEmitterService","NiagaraScratchPadService","NiagaraService"]
unreal_classes	["NiagaraEmitter","NiagaraScript"]
keywords	["niagara emitter","rapid iteration","particle spawn","particle update","emitter update","niagara color","color from curve","ColorFromCurve","color tint","hue shift","color curve keys","NiagaraEmitterService","NiagaraScratchPadService","scratch pad","scratch module","custom hlsl","parameter map get","parameter map set","niagara graph","splat","grid 2d","render target","set_color_tint","shift_color_hue","get_color_curve_keys","set_rapid_iteration_param","create_scratch_module","add_custom_hlsl_node","add_module_input","connect_pins"]

🧠 Brains complement: IF an unreal-engine-skills-manager tool (external MCP) exists in this session, call it with {action: "load", skill: "niagara-vfx"} for UE domain knowledge on this topic — correct APIs, architecture, best practices — and treat it as the rubric for any review / "best practices" question. If no such tool is available (e.g. running under Claude Code or Codex without that MCP), skip this line entirely and proceed with this skill alone — do NOT attempt the call.

Niagara Emitters Skill

Architecture (read first): VibeUE extends Unreal's native MCP endpoint. Emitter module and renderer CRUD (add/remove/enable/reorder modules, add/remove renderers, set module/renderer inputs, search module scripts) are owned by the engine NiagaraToolsets.* toolsets, called through call_tool. VibeUE's NiagaraEmitterService was trimmed to the color/curve authoring the engine doesn't provide, plus a rapid-iteration-parameter reader.

VibeUE NiagaraEmitterService (this skill) keeps ONLY color/curve authoring + a param reader:

• set_color_tint — add/set a ScaleColor tint (handles ColorFromCurve automatically)
• get_color_curve_keys / set_color_curve_keys — read/replace ColorFromCurve keyframes
• shift_color_hue — hue-rotate a ColorFromCurve while preserving detail (best for recolors)
• get_rapid_iteration_parameters — read an emitter's rapid-iteration params

NiagaraScratchPadService authors scratch-pad module graphs:

• Create empty scratch modules on any stage
• Drop Map Get / Map Set / Op / Custom HLSL nodes
• Add typed pins, connect pins, declare module inputs/outputs
• Apply + recompile in one call

For module / renderer CRUD → engine NiagaraToolsets.* via call_tool (discover with list_toolsets / describe_toolset). For system-level operations (create system, add emitters, user params, compile) → engine NiagaraToolsets.* and the niagara-systems skill. Rapid-iteration param writes (set_rapid_iteration_param*) live on (niagara-systems skill).