dcc-mcp-substance3d-designer

Showcase: reference image to Designer materials and Blender lookdev

A Codex-generated reference guided a 2.2 m wooden crate modeled in Blender with painted wood and rusted steel authored in Substance 3D Designer 16. Wood scratches, metal scratches and rust are independent procedural layers in the SD graphs. Their exported PBR maps drive the Blender materials. Layered broken battens combine attached wood fibers with native SD height displacement; fine wood grain uses a separate UV layer with consistent physical density.

Codex-generated reference	Blender Cycles render using SD maps

Model UVs — coordinates and a rendered checker:

UV coordinates	Checker on the model

Wood detail uses one tile per 0.45 m. UVs intentionally tile and overlap; the UV review explains the two layers and the existing steel UVs.

Complete material graphs — unretouched Designer screenshots:

Painted wood: 37 nodes	Rusted steel: 35 nodes

Blender scene with packed textures · Editable SBS, SBSAR, maps and workflow · UV checker · Broken wood detail · Blender showcase · Website gallery · Earlier color-correction study

The crate is a reference-guided modeling and lookdev study. Its proportions, board UVs and hardware were authored in Blender; it is not a scan of the generated image. The material screenshots use the project's DCC-CUA route.

Agent workflow

AI agents should use the shared gateway through dcc-mcp-cli; IDE users may continue to use the MCP endpoint. Prefer typed skills and tools over raw scripts.

Install or update the CLI

dcc-mcp-cli is the preferred control path for every shell-capable agent. If it is missing, ask the user before installing the latest official release:

# Linux/macOS
curl -fsSL https://raw.githubusercontent.com/dcc-mcp/dcc-mcp-core/main/scripts/install-cli.sh | sh

# Windows PowerShell
powershell -ExecutionPolicy Bypass -c "irm https://raw.githubusercontent.com/dcc-mcp/dcc-mcp-core/main/scripts/install-cli.ps1 | iex"

Keep an official build current through the release manifest:

dcc-mcp-cli update check
dcc-mcp-cli update apply

update apply downloads and stages the latest CLI for the next launch. It does not update a running dcc-mcp-server; update that server in its own environment.

dcc-mcp-cli dcc-types
dcc-mcp-cli list
dcc-mcp-cli search --query "<task>" --dcc-type substance3d_designer
dcc-mcp-cli describe <tool-slug>
dcc-mcp-cli call <tool-slug> --json '{"key":"value"}'

dcc-types reports release-catalog support; list reports live sessions. If a tool belongs to an inactive progressive skill, call dcc-mcp-cli load-skill <skill-name> --dcc-type substance3d_designer before retrying. For post-task improvement, attach a stable session id with --meta-json, query dcc-mcp-cli stats --range 24h --session-id <task-id>, then pass the bounded evidence to the review_skill_improvement prompt from dcc-mcp-skills-creator.

Substance 3D Designer adapter for the DCC Model Context Protocol (MCP).

The package runs an embedded Streamable HTTP MCP server inside Designer, so tools execute through Designer's Qt main thread instead of a separate process.

Install and load

Follow the canonical Install SOP for automatic host discovery, a zero-write plan, staged installation, receipt-owned uninstall, and verify-to-usable diagnostics:

python3.11 -m pip install dcc-mcp-substance3d-designer
dcc-mcp-substance3d-designer install --dcc-path "/path/to/Designer" --python python3.11 --json --dry-run
dcc-mcp-substance3d-designer install --dcc-path "/path/to/Designer" --python python3.11 --json --yes

The receipted launcher preserves existing SBS_DESIGNER_PYTHON_PATH and PYTHONPATH values while adding the dedicated plugin. A source checkout may still be loaded interactively through Tools > Plugin Manager as documented in the SOP. Each adapter instance uses an OS-assigned port and registers it for CLI discovery. Connect through the stable gateway at http://127.0.0.1:9765/mcp; set DCC_MCP_SUBSTANCE3D_DESIGNER_PORT only when a fixed direct endpoint is required. Standard DCC_MCP_GATEWAY_PORT and DCC_MCP_REGISTRY_DIR settings are also honoured.

For unattended launches, pass Designer a persistent configuration with --config-file <path-to-default_configuration.sbscfg>. This prevents a stale session-specific configuration reference from opening a blocking startup dialog.

Bundled skills

designer-session provides typed tools for inspecting the active Designer session and creating a rendered procedural PBR material package. Host APIs are imported only while a tool runs, so metadata discovery remains safe outside Designer.

Development

python -m pip install -e ".[dev]"
python -m pytest
ruff check src tests tools
python -m build

Releases use release-please. The release.yml workflow publishes through the pypi environment using PyPI Trusted Publishing.

Reference-material reconstruction

designer-session.create_imported_pbr_material accepts either packed RMA/ARM maps or separate roughness_path and metallic_path, alongside the required base-color and normal maps. Separate AO is optional. height_path works with either mode; packed and separate scalar maps cannot be mixed. Set embed_resources: true to embed the source bitmaps in the editable .sbs instead of linking them.

Example tool arguments (replace the paths with existing source maps):

{
  "package_path": "C:/materials/sample/material.sbs",
  "output_dir": "C:/materials/sample/maps",
  "base_color_path": "C:/sources/basecolor.png",
  "normal_path": "C:/sources/normal.png",
  "roughness_path": "C:/sources/roughness.png",
  "metallic_path": "C:/sources/metallic.png",
  "ambient_occlusion_path": "C:/sources/ao.png",
  "height_path": "C:/sources/height.png",
  "embed_resources": true,
  "open_in_editor": false
}

This creates an editable bitmap/output graph, not a recovered procedural material. Use the existing node creation, connection and parameter tools to construct and iterate procedural structure when needed. Source images must already be PBR maps; a lit reference photograph is not directly a base-color map. A single image does not uniquely determine roughness, metallic response, illumination or physical height. Record these as estimates until checked against additional evidence.

For a Designer-to-Painter handoff, pass the returned texture_files to Painter's create_textured_pbr_layer, mapping AmbientOcclusion to ambient_occlusion_path and optional Height to height_path. Keep the normal convention and color-management configuration consistent across both hosts. The import helper writes PNG previews without a configurable bit-depth contract; retain original high-precision height sources when precision matters.

Before accepting a result, reopen the saved .sbs and .spp, inspect graph connections and layer channels, verify the exported maps, and compare actual host renders under matched lighting, camera and scale. File existence and mocked SDK tests do not verify the visual result. Use a fresh output directory per iteration.

See the reference-material capability matrix for node inspection, connection guards, resource instancing, persistence/export contracts and remaining live-host validation. Parameter exposure uses public graph inputs and property function graphs; unsupported SDK variable readers return EXPOSE_API_UNAVAILABLE. Native PNG exports report actual channel count and bit depth, and graph input edits are verified by readback.