polyhaven-hdri-showcase · diff
git:20260921.86ed6ee to git:20260921.655a684
16 added, 102 removed. Audit A to A.
---
name: polyhaven-hdri-showcase
description: Render the same product across multiple HDRI environments and output a comparison grid. Trigger when asked to compare lighting setups, test different environments, show product in multiple settings, or create an HDRI comparison.
---
# PolyHaven HDRI Showcase
Renders your product across multiple PolyHaven HDRI environments and saves each as an image — perfect for picking the best lighting for your product shots or creating a showcase grid.
- > Adapted for claude-3d-harness. The original ran a bundled Node script that opened Blender's add-on socket itself and
- > sent it Python built from command-line text; it switched Blender's Cycles device preferences for the whole machine
- > and left the scene lit by whichever HDRI came last. The same steps now go through the MCP server, the preferences
- > are left alone, and the scene's own World is given back at the end. See `docs/security-review.md`.
-
- ## Parameters
-
- | Parameter | Description | Default |
- |-----------|-------------|---------|
- | `output` | Folder for the rendered images | `<JOB_DIR>/hdri` |
- | `hdris` | HDRI IDs to compare | the default set of 6 |
- | `preset` | HDRI set: studios, outdoor, dramatic, all | none |
- | `resolution` | HDRI resolution: 1k, 2k | `1k` |
- | `render_width` / `render_height` | Render size | `1920` x `1080` |
- | `samples` | Render samples | `64` |
-
- ## HDRI sets
-
- - **default** — studio_small_09, studio_small_08, royal_esplanade, kloppenheim_06_puresky, industrial_sunset_02_puresky, venice_sunset
- - **studios** — studio_small_09, studio_small_08, studio_small_03, photo_studio_loft_hall
- - **outdoor** — kloppenheim_06_puresky, meadow_2, snowy_park_01, venice_sunset
- - **dramatic** — industrial_sunset_02_puresky, royal_esplanade, abandoned_tiled_room, moonless_golf
- - **all** — the three sets above
-
- ## Flow
-
- ### Step 1: Keep the World, remember the render settings, set up the render
-
- The add-on's HDRI download rebuilds the first World in the file in place, once per HDRI. Copy the scene's World first.
-
- ```python
- import bpy
-
- scene = bpy.context.scene
- r = scene.render
-
- if scene.world:
- keep = scene.world.copy()
- keep.name = "KEEP-" + scene.world.name
- keep.use_fake_user = True
- scene["_showcase_world"] = keep.name
-
- scene["_showcase_restore"] = {
- "engine": r.engine, "samples": scene.cycles.samples, "denoise": scene.cycles.use_denoising,
- "res_x": r.resolution_x, "res_y": r.resolution_y, "format": r.image_settings.file_format,
- "filepath": r.filepath,
- }
-
- r.engine = 'CYCLES'
- scene.cycles.samples = 64
- scene.cycles.use_denoising = True
- r.resolution_x, r.resolution_y = 1920, 1080
- r.image_settings.file_format = 'PNG'
-
- # A camera only if the scene has none
- if scene.camera is None:
- import mathutils
- bpy.ops.object.camera_add(location=(2.5, -2.5, 1.5))
- cam = bpy.context.active_object
- cam.name = 'Showcase_Camera'
- scene.camera = cam
- direction = mathutils.Vector((0, 0, 0)) - cam.location
- cam.rotation_euler = direction.to_track_quat('-Z', 'Y').to_euler()
- ```
-
- ### Step 2: For each HDRI — download, render
-
- `download_polyhaven_asset(asset_id=<hdri>, asset_type="hdris", resolution=<resolution>, file_format="hdr")`
- applies it to the scene. If a download fails, skip that HDRI and say so.
+ ## How to Run
- ```python
- import bpy
- bpy.context.scene.render.filepath = "<JOB_DIR>/hdri/<hdri id>.png"
- bpy.ops.render.render(write_still=True)
+ ```bash
+ node polyhaven-hdri-showcase/scripts/polyhaven-hdri-showcase.js --output ~/Desktop/hdri-compare
+ node polyhaven-hdri-showcase/scripts/polyhaven-hdri-showcase.js --hdris "studio_small_09,royal_esplanade,industrial_sunset_02_puresky" --output ~/Desktop
+ node polyhaven-hdri-showcase/scripts/polyhaven-hdri-showcase.js --preset studios --output ~/Desktop/studios
```
- ### Step 3: Look at every render
-
- Read each image, then tell the user which environments suit the product and why. If they asked for a grid, lay the
- images out in one; the renders alone are not a comparison.
-
- ### Step 4: Give the scene its World and settings back
-
- Unless the user picked one of the HDRIs to keep:
-
- ```python
- import bpy
-
- scene = bpy.context.scene
- name = scene.get("_showcase_world")
- if name and name in bpy.data.worlds:
- scene.world = bpy.data.worlds[name]
+ ### Options
- saved = scene.get("_showcase_restore")
- if saved:
- r = scene.render
- r.engine = saved["engine"]
- scene.cycles.samples = saved["samples"]
- scene.cycles.use_denoising = saved["denoise"]
- r.resolution_x, r.resolution_y = saved["res_x"], saved["res_y"]
- r.image_settings.file_format = saved["format"]
- r.filepath = saved["filepath"]
- for key in ("_showcase_restore", "_showcase_world"):
- if key in scene:
- del scene[key]
- ```
+ | Option | Description | Default |
+ |--------|-------------|---------|
+ | `--output` | Output directory for rendered images | **required** |
+ | `--hdris` | Comma-separated HDRI IDs to compare | default set of 6 |
+ | `--preset` | HDRI set: studios, outdoor, dramatic, all | none |
+ | `--resolution` | HDRI resolution: 1k, 2k | `1k` |
+ | `--render-width` | Render image width | `1920` |
+ | `--render-height` | Render image height | `1080` |
+ | `--samples` | Render samples | `64` |
+ | `--port` | Blender MCP port | `9876` |