{ "x402Version": 2, "id": 8216, "slug": "8216", "resource": "https://asset.api.williamrobinson.dev/v1/asset/prepare", "description": "Normalise a glTF 2.0 binary (.glb) for a target engine and platform (scale, orientation, origin), generate two simplified LODs and convex/trimesh collision, and prove the result loads via a real Godot 4 headless import. Returns a report plus artifacts: normalised .glb LODs, collision data, a Godot scene, a multi-view preview, and the full JSON report. 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"expect": { "size": { "axis": "y", "metres": 1.5, "tolerance": 0.05 } }, "target": { "collision": "convex", "engine": "godot4", "origin": "floor", "platform": "desktop", "size": { "axis": "y", "metres": 1.5 } } }, "bodyType": "json", "method": "POST", "type": "http" }, "output": { "example": { "artifacts": [ { "href": "https://asset.api.williamrobinson.dev/v1/asset/artifacts/0123456789abcdef0123456789abcdef0123456789abcdef/asset.glb", "mediaType": "model/gltf-binary", "name": "asset.glb", "sha256": "2a0a6c99a17389b01c396387e77314d0e310b051a9d678615cf93466265a67f3", "sizeBytes": 2192 }, { "href": "https://asset.api.williamrobinson.dev/v1/asset/artifacts/0123456789abcdef0123456789abcdef0123456789abcdef/asset-lod1.glb", "mediaType": "model/gltf-binary", "name": "asset-lod1.glb", "sha256": "2a0a6c99a17389b01c396387e77314d0e310b051a9d678615cf93466265a67f3", "sizeBytes": 2192 }, { "href": "https://asset.api.williamrobinson.dev/v1/asset/artifacts/0123456789abcdef0123456789abcdef0123456789abcdef/asset-lod2.glb", "mediaType": "model/gltf-binary", "name": "asset-lod2.glb", "sha256": "2a0a6c99a17389b01c396387e77314d0e310b051a9d678615cf93466265a67f3", "sizeBytes": 2192 }, { "href": "https://asset.api.williamrobinson.dev/v1/asset/artifacts/0123456789abcdef0123456789abcdef0123456789abcdef/collision.json", "mediaType": "application/json", "name": "collision.json", "sha256": "fdd3b75d3487097c27178cdca98bcac4eb4f11a543a4bcdd6ffc5be5344501a7", "sizeBytes": 734 }, { "href": "https://asset.api.williamrobinson.dev/v1/asset/artifacts/0123456789abcdef0123456789abcdef0123456789abcdef/godot-scene.tscn", "mediaType": "text/plain; charset=utf-8", "name": "godot-scene.tscn", "sha256": "c1fb2c48896dad0573523724f75dccae20ee908ce9b4b781da13fa5d6008da49", "sizeBytes": 718 }, { "href": 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"bounds_expected", "detail": "Expected extent along 'y' of 1.5 m; output measures 1.5000 m.", "status": "passed" }, { "code": "rigged_expected", "detail": "No expect.rigged was declared.", "status": "not_checked" }, { "code": "animations_expected", "detail": "No expect.minAnimations was declared.", "status": "not_checked" }, { "code": "engine_loaded", "detail": "The output asset loaded and instantiated in Godot 4 headless.", "status": "passed" }, { "code": "textures_within_budget", "detail": "Largest output texture edge is 64px against a 2048px budget.", "status": "passed" }, { "code": "power_of_two_textures", "detail": "All output textures have power-of-two dimensions.", "status": "passed" }, { "code": "lods_generated", "detail": "LOD1/LOD2 are identical to LOD0; the geometry is already below the simplifier's useful reduction threshold.", "status": "passed" }, { "code": "collision_generated", "detail": "Convex hull has 8 vertices.", "status": "passed" } ], "collision": { "convexHullVertices": 8, "kind": "convex", "trimeshTriangles": 0 }, "engineLoad": { "animations": [], "engine": "4.7.2.stable.official.ed1daf0bf", "errors": [], "loaded": true, "materials": 1, "meshInstances": 1, "nodes": 2, "skeletons": 0 }, "expiresAt": "2026-01-04T03:04:05.000Z", "limitations": [ "No Unity or Unreal import is executed; for those engines the asset is normalised to standard glTF conventions their importers expect, not verified by running an actual Unity/Unreal import.", "Draco, EXT_meshopt_compression, and KTX2 (KHR_texture_basisu) inputs are rejected in v1; only embedded, uncompressed glTF geometry and PNG/JPEG textures are accepted.", "Normal-map and other non-colour texture colour space is not verified; textures are resized without reinterpreting their intended colour space.", "LOD error is the meshoptimizer geometric error bound actually reached (as a fraction of mesh radius), not a measure of visual/perceptual difference, and is not a proof the LODs are optimal.", "Godot's collision generation operates on the LOD0 mesh merged into one shape; per-part or compound collision shapes are not produced." ], "lods": [ { "bytes": 2192, "error": 0, "name": "asset.glb", "ratio": 1, "triangles": 12, "vertices": 24 }, { "bytes": 2192, "error": 0, "name": "asset-lod1.glb", "ratio": 0.5, "triangles": 12, "vertices": 24 }, { "bytes": 2192, "error": 0, "name": "asset-lod2.glb", "ratio": 0.25, "triangles": 12, "vertices": 24 } ], "normalization": { "rotationXDegrees": 0, "scale": 1.5, "translation": [ 0, 0.75, 0 ] }, "output": { "animations": 0, "bones": 0, "bounds": { "max": [ 0.75, 1.5, 0.75 ], "min": [ -0.75, 0, -0.75 ], "size": [ 1.5, 1.5, 1.5 ] }, "bytes": 2192, "materials": 1, "maxTextureEdge": 64, "meshes": 1, "nodes": 1, "primitives": 1, "skins": 0, "textures": 1, "triangles": 12, "vertices": 24 }, "repairs": [], "source": { "animations": 0, "bones": 0, "bounds": { "max": [ 0.5, 0.5, 0.5 ], "min": [ -0.5, -0.5, -0.5 ], "size": [ 1, 1, 1 ] }, "bytes": 2192, "materials": 1, "maxTextureEdge": 64, "meshes": 1, "nodes": 1, "primitives": 1, "skins": 0, "textures": 1, "triangles": 12, "validatorErrors": 0, "validatorWarnings": 0, "vertices": 24 }, "status": "passed", "target": { "collision": "convex", "engine": "godot4", "maxTextureSize": 2048, "origin": "floor", "platform": "desktop", "size": { "axis": "y", "metres": 1.5 }, "sourceUp": "y" }, "tools": { "engine": "4.7.2.stable.official.ed1daf0bf", "transform": "@gltf-transform/core@4.5.0 meshoptimizer@0.24.0 sharp@0.34.5 resvg@2.6.2", "validator": "gltf-validator@2.0.0-dev.3.10" }, "truncated": false, "validator": [], "warnings": [ "LOD simplifier could not reduce a mesh primitive below its LOD0 triangle count (12 triangles); the geometry is likely already below the simplifier's useful reduction threshold.", "LOD simplifier could not reduce a mesh primitive below its LOD0 triangle count (12 triangles); the geometry is likely already below the simplifier's useful reduction threshold." ] }, "type": "json" } }, "schema": { "$schema": "https://json-schema.org/draft/2020-12/schema", "properties": { "input": { "additionalProperties": false, "properties": { "body": { "$defs": { "axis": { "enum": [ "y", "z" ], "type": "string" }, "collision": { "enum": [ "none", "convex", "convex+trimesh" ], "type": "string" }, "size": { "additionalProperties": false, "properties": { "axis": { "$ref": "#/properties/input/properties/body/$defs/sizeAxis" }, "metres": { "exclusiveMinimum": 0, "maximum": 1000, "type": "number" } }, "required": [ "axis", "metres" ], "type": "object" }, "sizeAxis": { "enum": [ "x", "y", "z", "max" ], "type": "string" }, "target": { "additionalProperties": false, "properties": { "collision": { "$ref": "#/properties/input/properties/body/$defs/collision", "default": "convex", "description": "Generate collision: none, a convex hull, or a convex hull plus a static trimesh." }, "engine": { "enum": [ "godot4", "unity", "unreal", "gltf" ], "type": "string" }, "maxTextureSize": { "description": "Maximum texture edge in pixels; defaults per platform (mobile 1024, desktop 2048) when omitted.", "maximum": 8192, "minimum": 1, "type": "integer" }, "origin": { "default": "keep", "description": "Where the origin ends up: unchanged, the bounds centre, or the centre of the bottom face.", "enum": [ "keep", "center", "floor" ], "type": "string" }, "platform": { "enum": [ "mobile", "desktop" ], "type": "string" }, "size": { "$ref": "#/properties/input/properties/body/$defs/size", "description": "Desired extent in metres along `axis` after normalisation; omitted keeps the source scale." }, "sourceUp": { "$ref": "#/properties/input/properties/body/$defs/axis", "default": "y", "description": "The source's up axis when known to be Z-up (Blender/Max exports); glTF is Y-up by default." } }, "required": [ "engine", "platform" ], "type": "object" } }, "$schema": "https://json-schema.org/draft/2020-12/schema", "additionalProperties": false, "properties": { "asset": { "contentEncoding": "base64", "description": "Base64-encoded glTF 2.0 binary (.glb) with embedded textures only (external URIs are rejected); decoded size must not exceed 4194304 bytes.", "maxLength": 5592408, "minLength": 1, "type": "string" }, "expect": { "additionalProperties": false, "properties": { "minAnimations": { "maximum": 64, "minimum": 0, "type": "integer" }, "rigged": { "description": "Require a skeleton (skinned character) to be present.", "type": "boolean" }, "size": { "additionalProperties": false, "description": "Expected extent in metres along `axis`, checked within `tolerance` (a fraction).", "properties": { "axis": { "$ref": "#/properties/input/properties/body/$defs/sizeAxis" }, "metres": { "exclusiveMinimum": 0, "maximum": 1000, "type": "number" }, "tolerance": { "default": 0.05, "maximum": 0.5, "minimum": 0, "type": "number" } }, "required": [ "axis", "metres" ], "type": "object" } }, "type": "object" }, "target": { "$ref": "#/properties/input/properties/body/$defs/target" } }, "required": [ "asset", "target" ], "type": "object" }, "bodyType": { "enum": [ "json", "form-data", "text" ], "type": "string" }, "method": { "enum": [ "POST" ], "type": "string" }, "type": { "const": "http", "type": "string" } }, "required": [ "type", "method", "bodyType", "body" ], "type": "object" }, "output": { "properties": { "example": { "$defs": { "artifact": { "additionalProperties": false, "properties": { "href": { "format": "uri", "type": "string" }, "mediaType": { "maxLength": 128, "minLength": 1, "type": "string" }, "name": { "enum": [ "asset.glb", "asset-lod1.glb", "asset-lod2.glb", "collision.json", "godot-scene.tscn", "preview.png", "report.json" ], "type": "string" }, "sha256": { "pattern": "^[a-f0-9]{64}$", "type": "string" }, "sizeBytes": { "minimum": 0, "type": "integer" } }, "required": [ "name", "mediaType", "sizeBytes", "sha256", "href" ], "type": "object" }, "bounds": { "additionalProperties": false, "properties": { "max": { "$ref": "#/properties/output/properties/example/$defs/vector3" }, "min": { "$ref": "#/properties/output/properties/example/$defs/vector3" }, "size": { "$ref": "#/properties/output/properties/example/$defs/vector3" } }, "required": [ "min", "max", "size" ], "type": "object" }, "check": { "additionalProperties": false, "properties": { "code": { "type": "string" }, "detail": { "maxLength": 2048, "type": "string" }, "status": { "enum": [ "passed", "failed", "not_checked" ], "type": "string" } }, "required": [ "code", "status", "detail" ], "type": "object" }, "collision": { "enum": [ "none", "convex", "convex+trimesh" ], "type": "string" }, "lod": { "additionalProperties": false, "properties": { "bytes": { "minimum": 0, "type": "integer" }, "error": { "minimum": 0, "type": "number" }, "name": { "enum": [ "asset.glb", "asset-lod1.glb", "asset-lod2.glb" ], "type": "string" }, "ratio": { "maximum": 1, "minimum": 0, "type": "number" }, "triangles": { "maximum": 250000, "minimum": 0, "type": "integer" }, "vertices": { "minimum": 0, "type": "integer" } }, "required": [ "name", "ratio", "triangles", "vertices", "bytes", "error" ], "type": "object" }, "target": { "additionalProperties": false, "properties": { "collision": { "$ref": "#/properties/output/properties/example/$defs/collision" }, "engine": { "enum": [ "godot4", "unity", "unreal", "gltf" ], "type": "string" }, "maxTextureSize": { "maximum": 8192, "minimum": 1, "type": "integer" }, "origin": { "enum": [ "keep", "center", "floor" ], "type": "string" }, "platform": { "enum": [ "mobile", "desktop" ], "type": "string" }, "size": { "additionalProperties": false, "properties": { "axis": { "enum": [ "x", "y", "z", "max" ], "type": "string" }, "metres": { "exclusiveMinimum": 0, "maximum": 1000, "type": "number" } }, "required": [ "axis", "metres" ], "type": "object" }, "sourceUp": { "enum": [ "y", "z" ], "type": "string" } }, "required": [ "engine", "platform", "sourceUp", "origin", "collision" ], "type": "object" }, "vector3": { "items": { "type": "number" }, "maxItems": 3, "minItems": 3, "type": "array" } }, "$schema": "https://json-schema.org/draft/2020-12/schema", "additionalProperties": false, "properties": { "artifacts": { "items": { "$ref": "#/properties/output/properties/example/$defs/artifact" }, "maxItems": 7, "type": "array" }, "checks": { "items": { "$ref": "#/properties/output/properties/example/$defs/check" }, "maxItems": 32, "type": "array" }, "collision": { "additionalProperties": false, "properties": { "convexHullVertices": { "minimum": 0, "type": "integer" }, "kind": { "$ref": "#/properties/output/properties/example/$defs/collision" }, "trimeshTriangles": { "minimum": 0, "type": "integer" } }, "required": [ "kind", "convexHullVertices", "trimeshTriangles" ], "type": "object" }, "engineLoad": { "additionalProperties": false, "properties": { "animations": { "items": { "maxLength": 256, "type": "string" }, "maxItems": 256, "type": "array" }, "engine": { "type": "string" }, "errors": { "items": { "maxLength": 2048, "type": "string" }, "maxItems": 64, "type": "array" }, "loaded": { "type": "boolean" }, "materials": { "minimum": 0, "type": "integer" }, "meshInstances": { "minimum": 0, "type": "integer" }, "nodes": { "minimum": 0, "type": "integer" }, "skeletons": { "minimum": 0, "type": "integer" } }, "required": [ "engine", "loaded", "nodes", "meshInstances", "materials", "skeletons", "animations", "errors" ], "type": "object" }, "expiresAt": { "format": "date-time", "type": "string" }, "limitations": { "items": { "maxLength": 4096, "type": "string" }, "maxItems": 16, "type": "array" }, "lods": { "items": { "$ref": "#/properties/output/properties/example/$defs/lod" }, "maxItems": 3, "minItems": 1, "type": "array" }, "normalization": { "additionalProperties": false, "properties": { "rotationXDegrees": { "type": "number" }, "scale": { "type": "number" }, "translation": { "$ref": "#/properties/output/properties/example/$defs/vector3" } }, "required": [ "scale", "rotationXDegrees", "translation" ], "type": "object" }, "output": { "additionalProperties": false, "properties": { "animations": { "minimum": 0, "type": "integer" }, "bones": { "minimum": 0, "type": "integer" }, "bounds": { "$ref": "#/properties/output/properties/example/$defs/bounds" }, "bytes": { "minimum": 0, "type": "integer" }, "materials": { "maximum": 32, "minimum": 0, "type": "integer" }, "maxTextureEdge": { "minimum": 0, "type": "integer" }, "meshes": { "minimum": 0, "type": "integer" }, "nodes": { "maximum": 2000, "minimum": 0, "type": "integer" }, "primitives": { "minimum": 0, "type": "integer" }, "skins": { "minimum": 0, "type": "integer" }, "textures": { "maximum": 32, "minimum": 0, "type": "integer" }, "triangles": { "maximum": 250000, "minimum": 0, "type": "integer" }, "vertices": { "minimum": 0, "type": "integer" } }, "required": [ "triangles", "vertices", "primitives", "meshes", "nodes", "materials", "textures", "maxTextureEdge", "skins", 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