Complete reference for the GenAI Model Generator plugin’s C++ classes, structs, and enums. All classes support both C++ TFunction callbacks and Blueprint DYNAMIC_MULTICAST_DELEGATE for full Blueprint compatibility.
Core Result Structs
FGenModel3DResult
Returned by all 3D generation tasks (Text-to-3D, Image-to-3D, Retexture).
| Field |
Type |
Description |
ModelBytes |
TArray<uint8> |
Raw downloaded model file data |
Format |
EGenModel3DFormat |
Output format (GLB, FBX, OBJ, USDZ, STL) |
ModelUrl |
FString |
Download URL for the generated model |
ThumbnailUrl |
FString |
Preview image URL (Meshy providers) |
TaskId |
FString |
Provider’s task identifier |
Progress |
int32 |
Generation progress (0–100) |
FGenMeshyRiggingResult
Returned by Meshy auto-rigging tasks.
| Field |
Type |
Description |
TaskId |
FString |
Rigging task identifier |
ModelBytes |
TArray<uint8> |
Downloaded rigged model file data |
Format |
EGenModel3DFormat |
Output format (GLB or FBX) |
RiggedGlbUrl |
FString |
Rigged character GLB download URL |
RiggedFbxUrl |
FString |
Rigged character FBX download URL |
WalkingGlbUrl |
FString |
Walking animation GLB URL |
RunningGlbUrl |
FString |
Running animation GLB URL |
Progress |
int32 |
Progress (0–100) |
FGenTripoAutoRigResult
Returned by Tripo auto-rigging tasks.
| Field |
Type |
Description |
TaskId |
FString |
Rigging task identifier |
ModelBytes |
TArray<uint8> |
Downloaded rigged model file data |
Format |
EGenModel3DFormat |
Output format |
ModelUrl |
FString |
Download URL for the rigged model |
Progress |
int32 |
Progress (0–100) |
FGenTextureResult
Returned by Google texture generation tasks.
| Field |
Type |
Description |
TextureBytes |
TArray<uint8> |
Generated texture image data (PNG) |
MapType |
EGenTextureMapType |
Which texture map type this result represents |
Generation Classes by Provider
Every generation class extends UCancellableAsyncAction and exposes two usage patterns:
- C++ direct call:
SendXxxRequest(Settings, Callback) — returns the HTTP request handle
- Blueprint / async node:
RequestXxx(WorldContext, Settings) — returns the async action, call Activate() to start, bind OnComplete and OnProgress delegates
Meshy AI
| Class |
Modes |
Settings Struct |
UGenMeshyTextTo3D |
Text-to-3D (auto-chains preview → refine) |
FGenMeshyTextTo3DSettings |
UGenMeshyImageTo3D |
Image-to-3D |
FGenMeshyImageTo3DSettings |
UGenMeshyRetexture |
Retexture existing models |
FGenMeshyRetextureSettings |
UGenMeshyRigging |
Auto-rig humanoid models |
FGenMeshyRiggingSettings |
UGenMeshyRemesh |
Retopologize and optimize mesh |
FGenMeshyRemeshSettings |
Meshy-specific features:
UGenMeshyTextTo3D automatically chains Preview → Refine when bAutoRefine = true (default). Progress is scaled: 0–50% = preview, 50–100% = refine.UGenMeshyRigging accepts either an InputTaskId (from a previous Meshy generation) or raw ModelBytes / ModelUrl for external models.
Tripo AI
| Class |
Modes |
Settings Struct |
UGenTripoTextTo3D |
Text-to-3D |
FGenTripoTextTo3DSettings |
UGenTripoImageTo3D |
Image-to-3D |
FGenTripoImageTo3DSettings |
UGenTripoRetexture |
Retexture existing models |
FGenTripoRetextureSettings |
UGenTripoAutoRig |
Auto-rig with creature types |
FGenTripoAutoRigSettings |
UGenTripoLowPoly |
Smart LowPoly conversion |
FGenTripoLowPolySettings |
Uses Tripo’s proprietary v3.1 model. Separate API key from Fal.ai’s TripoSR.
Tripo-specific features:
UGenTripoAutoRig runs a 3-step chained pipeline (pre-rig check -> rig -> retarget) with scaled progress reporting. Supports 7 creature rig types and 11 animation presets.UGenTripoRetexture chains from the last Tripo generation task ID — no file upload needed.UGenTripoLowPoly converts high-poly models to game-ready low-poly with configurable face limits and baked textures.
Fal.ai (All Models)
| Class |
Modes |
Settings Struct |
UGenFalImageTo3D |
Text-to-3D, Image-to-3D (routes to selected model) |
FGenFalImageTo3DSettings |
A single class handles all four Fal.ai models. Set FalModel in the settings to choose:
EGenFalModel Value |
AI Model |
Supported Modes |
Hunyuan3D |
Tencent Hunyuan3D v2.1 |
Image-to-3D |
Hunyuan3D_V3 |
Tencent Hunyuan3D v3.1 Pro |
Text-to-3D |
TripoSR |
TripoSR (MIT, open-source) |
Image-to-3D only |
Rodin |
Hyper3D Rodin Gen-2 |
Text-to-3D, Image-to-3D |
Trellis2 |
Microsoft Trellis 2 |
Image-to-3D only |
Model-specific parameters: Only Hunyuan3D models use NumInferenceSteps, GuidanceScale, GenerateType, bEnablePBR, and FaceCount. These parameters are ignored for TripoSR, Rodin, and Trellis 2.
Hyper3D Rodin (Direct API)
| Class |
Modes |
Settings Struct |
UGenRodinImageTo3D |
Text-to-3D, Image-to-3D |
FGenRodinImageTo3DSettings |
Direct integration with Rodin’s own API. Requires a separate Rodin API key and a Business-tier subscription ($120/mo). For most users, Fal.ai - Rodin is recommended instead — same Gen-2 model, no subscription, $0.40/gen.
Google (Texture Generation)
| Class |
Modes |
Settings Struct |
UGenGoogleTextureGeneration |
Texture Generation, Reference Image |
FGenGoogleTextureSettings |
Uses Google Gemini 3.1 Flash for AI image generation. Set TextureMapType to control output:
BaseColor, Normal, Roughness, Metallic — individual PBR mapsFullPBR — generates a base color optimized for PBR workflowsReferenceImage — generates concept art for feeding into Image-to-3D
Settings Structs Detail
FGenMeshyTextTo3DSettings
| Field |
Type |
Default |
Description |
Prompt |
FString |
— |
Text prompt (max 600 chars) |
NegativePrompt |
FString |
— |
What to avoid |
ArtStyle |
FString |
"realistic" |
Art style (realistic, cartoon, sculpture, pbr) |
Topology |
EGenModelTopology |
Triangle |
Triangle or Quad mesh |
TargetPolycount |
int32 |
30000 |
Target polygons (100–300,000) |
Symmetry |
EGenMeshySymmetry |
Auto |
Auto, On, or Off |
bAutoRefine |
bool |
true |
Auto-chain preview → refine |
bEnablePBR |
bool |
false |
Generate PBR maps during refine |
TexturePrompt |
FString |
— |
Additional prompt for texturing |
FGenMeshyImageTo3DSettings
| Field |
Type |
Default |
Description |
ImageUrl |
FString |
— |
URL to input image |
ImageBytes |
TArray<uint8> |
— |
Raw image bytes (alternative) |
Topology |
EGenModelTopology |
Triangle |
Triangle or Quad |
TargetPolycount |
int32 |
30000 |
Target polygons (100–300,000) |
Symmetry |
EGenMeshySymmetry |
Auto |
Symmetry mode |
bEnablePBR |
bool |
false |
Generate PBR maps |
TexturePrompt |
FString |
— |
Texture guidance prompt |
FGenMeshyRiggingSettings
| Field |
Type |
Default |
Description |
InputTaskId |
FString |
— |
Meshy task ID (takes precedence, max 300K faces) |
ModelUrl |
FString |
— |
URL to GLB model (if no task ID) |
ModelBytes |
TArray<uint8> |
— |
Raw model bytes (base64-encoded for upload) |
HeightMeters |
float |
1.7 |
Character height in meters |
FGenMeshyRetextureSettings
| Field |
Type |
Default |
Description |
ModelUrl |
FString |
— |
URL to model to retexture |
ModelBytes |
TArray<uint8> |
— |
Raw model bytes (alternative) |
Prompt |
FString |
— |
Desired texture description |
NegativePrompt |
FString |
— |
What to avoid |
ArtStyle |
FString |
"realistic" |
Art style |
TextureResolution |
int32 |
2048 |
Texture resolution (1024–4096) |
FGenMeshyRemeshSettings
| Field |
Type |
Default |
Description |
InputTaskId |
FString |
— |
Meshy task ID (from a previous generation) |
ModelUrl |
FString |
— |
URL to model to remesh (if no task ID) |
ModelBytes |
TArray<uint8> |
— |
Raw model bytes (alternative) |
TargetPolycount |
int32 |
30000 |
Desired face count for output mesh |
Topology |
EGenModelTopology |
Triangle |
Triangle or Quad output |
bAutoSize |
bool |
true |
Automatically scale model to standard size |
ResizeHeight |
float |
1.0 |
Manual height override when auto-size disabled |
FGenFalImageTo3DSettings
| Field |
Type |
Default |
Description |
FalModel |
EGenFalModel |
Hunyuan3D |
Which Fal.ai model to use |
ImageUrl |
FString |
— |
URL to input image |
ImageBytes |
TArray<uint8> |
— |
Raw image bytes (alternative) |
Prompt |
FString |
— |
Text prompt |
NumInferenceSteps |
int32 |
30 |
Denoising steps (Hunyuan only, 1–100) |
GuidanceScale |
float |
5.5 |
Prompt adherence (Hunyuan only, 1–20) |
GenerateType |
FString |
"Normal" |
“Normal” (textured) or “Geometry” (Hunyuan only) |
bEnablePBR |
bool |
false |
PBR materials (Hunyuan only) |
FaceCount |
int32 |
500000 |
Target faces (Hunyuan only, 40K–1.5M) |
OutputFormat |
EGenModel3DFormat |
GLB |
Output format |
FGenTripoTextTo3DSettings / FGenTripoImageTo3DSettings
| Field |
Type |
Default |
Description |
Prompt |
FString |
— |
Text prompt (Text-to-3D only) |
NegativePrompt |
FString |
— |
What to avoid (Text-to-3D only) |
ImageUrl |
FString |
— |
Input image URL (Image-to-3D only) |
ImageBytes |
TArray<uint8> |
— |
Raw image bytes (Image-to-3D only) |
OutputFormat |
EGenModel3DFormat |
GLB |
Output format |
FGenTripoRetextureSettings
| Field |
Type |
Default |
Description |
InputTaskId |
FString |
— |
Tripo task ID from a previous generation (auto-populated) |
Prompt |
FString |
— |
Texture description prompt |
OutputFormat |
EGenModel3DFormat |
GLB |
Output format |
FGenTripoAutoRigSettings
| Field |
Type |
Default |
Description |
InputTaskId |
FString |
— |
Tripo task ID from a previous generation (auto-populated) |
RigType |
EGenTripoRigType |
Biped |
Creature rig type |
AnimationPreset |
EGenTripoAnimationPreset |
Idle |
Animation to apply after rigging |
OutputFormat |
EGenModel3DFormat |
GLB |
Output format |
FGenTripoLowPolySettings
| Field |
Type |
Default |
Description |
InputTaskId |
FString |
— |
Tripo task ID from a previous generation (auto-populated) |
FaceLimit |
int32 |
5000 |
Target face count (1,000–20,000) |
bQuadFaces |
bool |
false |
Output quad topology instead of triangles |
bBakeTextures |
bool |
true |
Bake high-poly textures onto the low-poly mesh |
OutputFormat |
EGenModel3DFormat |
GLB |
Output format |
FGenGoogleTextureSettings
| Field |
Type |
Default |
Description |
Prompt |
FString |
— |
Texture description |
ReferenceImageBytes |
TArray<uint8> |
— |
Reference image for style transfer |
MimeType |
FString |
"image/png" |
MIME type of reference image |
TextureMapType |
EGenTextureMapType |
BaseColor |
Map type to generate |
bSeamless |
bool |
true |
Generate tileable texture |
ImageSize |
FString |
"1K" |
Output resolution |
AspectRatio |
FString |
"1:1" |
Output aspect ratio |
Key Enums
| Enum |
Values |
Used By |
EGenModel3DFormat |
GLB, FBX, OBJ, USDZ, STL |
All 3D providers |
EGenModelTopology |
Triangle, Quad |
Meshy |
EGenFalModel |
Hunyuan3D, Hunyuan3D_V3, TripoSR, Rodin, Trellis2 |
Fal.ai |
EGenMeshyAIModel |
Meshy6, Meshy5, Meshy4 |
Meshy |
EGenMeshySymmetry |
Auto, On, Off |
Meshy |
EGenTripoModelVersion |
V3_1, V2_5, V2_0 |
Tripo AI |
EGenTripoRigType |
Biped, Quadruped, Hexapod, Octopod, Avian, Serpentine, Aquatic |
Tripo AI Auto-Rig |
EGenTripoAnimationPreset |
Idle, Walk, Run, Jump, Slash, Shoot, Dive, Climb, Hurt, Fall, Turn |
Tripo AI Auto-Rig |
EGenRodinConditionType |
Image, Text |
Rodin (direct) |
EGenRodinTier |
Regular, Sketch, Detail, Smooth |
Rodin (direct) |
EGenRodinMeshQuality |
Low (500 tri), Medium (10K), High (50K), Ultra (300K) |
Rodin (direct) |
EGenRodinMaterial |
PBR, Shaded |
Rodin (direct) |
EGenTextureMapType |
BaseColor, Normal, Roughness, Metallic, FullPBR, ReferenceImage |
Google |
Plugin Settings
Access via Project Settings > Plugins > GenAI Model Generator or GetDefault<UGenModelSettings>() in C++:
| Setting |
Type |
Default |
Description |
| Meshy API Key |
FString |
— |
API key for Meshy AI |
| Tripo AI API Key |
FString |
— |
API key for Tripo AI |
| Fal.ai API Key |
FString |
— |
Shared key for Hunyuan3D, TripoSR, Rodin, Trellis 2 |
| Google API Key |
FString |
— |
API key for Google Gemini |
| Per-Organization Endpoints |
TMap<EGenModelOrgs, FString> |
— |
Override base API URLs (for proxies) |
| Poll Interval |
float |
6.0 |
Task status check interval (1–30 seconds) |
| Extended Logging |
bool |
false |
Log full request/response JSON |
| Include Keys In Build (UNSAFE) |
bool |
false |
Include keys in packaged builds |
Provider Documentation