AlexZ005 · Oct 23, 2026 · Oct 25, 2026
diff --git a/README.md b/README.md
@@ -11,6 +11,7 @@ default/                         The Prototype starter models (logo, Svelte rune
 cube_diorama/                    Blender Studio's Cube Diorama, split per object (CC0)
 khronos-sample-assets/           metadata only — model bytes are fetched straight from
                                  github.com/KhronosGroup/glTF-Sample-Assets (CC-BY 4.0)
+backgrounds/                     shader background presets: 5 fluid (CC0) + 8 Gradient (MIT, ShaderGradient-adapted)
 audio-essentials/                23 CC0 sounds (Kenney + OpenGameArt), installable .zip
 nature-kit/                      Nature & Terrain: 31 trees/plants/rocks/cliff/path/pond pieces
                                  (made with Meshy.ai, CC0) — see nature-kit/kit.md
@@ -104,6 +105,9 @@ reading the ref they were built against.
   post-processed here (`tools/architecture-kit/`) — see its `attribution.html` and `kit.md`.
 - `props-kit/` — © theprototype, CC0; made with [Meshy.ai](https://www.meshy.ai) (paid
   plan: the output is ours) plus procedural pieces — see its `attribution.html` and `kit.md`.
+- `backgrounds/` — shader background presets: the fluid set is © theprototype, CC0; the Gradient family's
+  parameter sets are adapted from [ShaderGradient](https://github.com/ruucm/shadergradient)'s presets, MIT
+  © ruucm, stone-skipper — see [backgrounds/ATTRIBUTION.md](backgrounds/ATTRIBUTION.md).
 - `audio-essentials/` — all CC0; per-file sources in
   [CREDITS.md](audio-essentials/CREDITS.md) (Kenney.nl, OpenGameArt).
 - `nature-kit/` — © theprototype, CC0; made with [Meshy.ai](https://www.meshy.ai) and

diff --git a/backgrounds/ATTRIBUTION.md b/backgrounds/ATTRIBUTION.md
@@ -0,0 +1,31 @@
+# backgrounds/ — attribution
+
+- **Fluid set** (`mesh-gradient`, `silk-gradient`, `noise-flow`, `metaballs`, `grain-dither`) — © theprototype,
+  CC0 1.0. Our own shader graphs (core roadmap 65 M2).
+- **Gradient family** (`ember-ribbon`, `violet-orb`, `mint-tide`, `glass-orbit`, `night-swell`, `indigo-bloom`,
+  `deep-space`, `tangerine-sea`; index rows with `"family": "Gradient"`) — the parameter sets are adapted from the
+  presets of **ShaderGradient** (https://github.com/ruucm/shadergradient, `packages/shadergradient/src/presets.ts`),
+  renamed and retuned for the app's Gradient lab node. They are therefore under ShaderGradient's MIT licence, below.
+  The node itself (a port of ShaderGradient's GLSL) lives in the core app, which carries the same notice on its
+  third-party licences page.
+
+All of these files are generated by `tools/backgrounds/build.cjs`.
+
+---
+
+MIT License
+
+Copyright (c) ruucm (https://github.com/ruucm), stone-skipper (https://github.com/stone-skipper)
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
+rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit
+persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
+Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
+WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/backgrounds/deep-space.json b/backgrounds/deep-space.json
@@ -0,0 +1,67 @@
+{
+	"format": 1,
+	"domain": "background",
+	"name": "Deep space",
+	"preset": "deep-space",
+	"license": "MIT",
+	"attribution": "Adapted from ShaderGradient presets (github.com/ruucm/shadergradient), MIT © ruucm, stone-skipper",
+	"layer": {
+		"pointer": false,
+		"scroll": false
+	},
+	"nodes": [
+		{
+			"id": "lab",
+			"type": "gradientLab",
+			"position": {
+				"x": 80,
+				"y": 80
+			},
+			"data": {
+				"shape": "waterPlane",
+				"color1": "#5606ff",
+				"color2": "#fe8989",
+				"color3": "#000000",
+				"speed": 0.1,
+				"density": 1.1,
+				"strength": 2.4,
+				"frequency": 0,
+				"amplitude": 0,
+				"brightness": 1.1,
+				"lighting": "ambient",
+				"environment": "city",
+				"reflection": 0.1,
+				"azimuth": 180,
+				"polar": 115,
+				"distance": 3.9,
+				"zoom": 1,
+				"fov": 45,
+				"posX": -0.5,
+				"posY": 0.1,
+				"posZ": 0,
+				"rotX": 0,
+				"rotY": 0,
+				"rotZ": 235,
+				"grain": 0
+			}
+		},
+		{
+			"id": "out",
+			"type": "backgroundOutput",
+			"position": {
+				"x": 420,
+				"y": 120
+			},
+			"data": {}
+		}
+	],
+	"edges": [
+		{
+			"id": "e-lab.out-out.color",
+			"source": "lab",
+			"sourceHandle": "out",
+			"target": "out",
+			"targetHandle": "color"
+		}
+	]
+}
diff --git a/backgrounds/ember-ribbon.json b/backgrounds/ember-ribbon.json
@@ -0,0 +1,67 @@
+{
+	"format": 1,
+	"domain": "background",
+	"name": "Ember ribbon",
+	"preset": "ember-ribbon",
+	"license": "MIT",
+	"attribution": "Adapted from ShaderGradient presets (github.com/ruucm/shadergradient), MIT © ruucm, stone-skipper",
+	"layer": {
+		"pointer": false,
+		"scroll": false
+	},
+	"nodes": [
+		{
+			"id": "lab",
+			"type": "gradientLab",
+			"position": {
+				"x": 80,
+				"y": 80
+			},
+			"data": {
+				"shape": "plane",
+				"color1": "#ff5005",
+				"color2": "#dbba95",
+				"color3": "#d0bce1",
+				"speed": 0.4,
+				"density": 1.3,
+				"strength": 4,
+				"frequency": 5.5,
+				"amplitude": 1,
+				"brightness": 1.2,
+				"lighting": "ambient",
+				"environment": "city",
+				"reflection": 0.1,
+				"azimuth": 180,
+				"polar": 90,
+				"distance": 3.6,
+				"zoom": 1,
+				"fov": 45,
+				"posX": -1.4,
+				"posY": 0,
+				"posZ": 0,
+				"rotX": 0,
+				"rotY": 10,
+				"rotZ": 50,
+				"grain": 1
+			}
+		},
+		{
+			"id": "out",
+			"type": "backgroundOutput",
+			"position": {
+				"x": 420,
+				"y": 120
+			},
+			"data": {}
+		}
+	],
+	"edges": [
+		{
+			"id": "e-lab.out-out.color",
+			"source": "lab",
+			"sourceHandle": "out",
+			"target": "out",
+			"targetHandle": "color"
+		}
+	]
+}
diff --git a/backgrounds/glass-orbit.json b/backgrounds/glass-orbit.json
@@ -0,0 +1,67 @@
+{
+	"format": 1,
+	"domain": "background",
+	"name": "Glass orbit",
+	"preset": "glass-orbit",
+	"license": "MIT",
+	"attribution": "Adapted from ShaderGradient presets (github.com/ruucm/shadergradient), MIT © ruucm, stone-skipper",
+	"layer": {
+		"pointer": false,
+		"scroll": false
+	},
+	"nodes": [
+		{
+			"id": "lab",
+			"type": "gradientLab",
+			"position": {
+				"x": 80,
+				"y": 80
+			},
+			"data": {
+				"shape": "sphere",
+				"color1": "#73bfc4",
+				"color2": "#ff810a",
+				"color3": "#8da0ce",
+				"speed": 0.3,
+				"density": 0.8,
+				"strength": 0.3,
+				"frequency": 5.5,
+				"amplitude": 3.2,
+				"brightness": 0.8,
+				"lighting": "environment",
+				"environment": "city",
+				"reflection": 0.4,
+				"azimuth": 270,
+				"polar": 180,
+				"distance": 14,
+				"zoom": 15.1,
+				"fov": 45,
+				"posX": -0.1,
+				"posY": 0,
+				"posZ": 0,
+				"rotX": 0,
+				"rotY": 130,
+				"rotZ": 70,
+				"grain": 1
+			}
+		},
+		{
+			"id": "out",
+			"type": "backgroundOutput",
+			"position": {
+				"x": 420,
+				"y": 120
+			},
+			"data": {}
+		}
+	],
+	"edges": [
+		{
+			"id": "e-lab.out-out.color",
+			"source": "lab",
+			"sourceHandle": "out",
+			"target": "out",
+			"targetHandle": "color"
+		}
+	]
+}