Image to Three.js Model
img2threejs/img2threejs
Rebuilds the object in a reference image as a procedural, animation-ready Three.js model written entirely in code, using staged sculpting with quality checks.
FlatRedBall ColorOperation enum (Add, Modulate, Color, etc.) shared across visual object types.
Install Color Operations
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install vchelaru/FlatRedBall color-operations --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/color-operations .claude/skills/color-operations && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .claude/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operationsType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install vchelaru/FlatRedBall color-operations --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/color-operations .agents/skills/color-operations && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .agents/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install vchelaru/FlatRedBall color-operations --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/color-operations .cursor/skills/color-operations && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .cursor/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/vchelaru/FlatRedBall.git --path .claude/skills/color-operations--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install vchelaru/FlatRedBall color-operations --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/color-operations .gemini/skills/color-operations && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .gemini/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install vchelaru/FlatRedBall color-operationsInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/color-operations .github/skills/color-operations && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .github/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add vchelaru/FlatRedBall --skill color-operations -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install vchelaru/FlatRedBall color-operations --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/vchelaru/FlatRedBall.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/color-operations .opencode/skills/color-operations && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "color-operations" agent skill from https://github.com/vchelaru/FlatRedBall/tree/NetStandard/.claude/skills/color-operations into .opencode/skills/color-operations/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "color-operations", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
color-operations- GitHub stars
- 578
- Token cost
- ~798 tokens
- SKILL.md length
- 288 words
- Files
- 1
- Skills in repo
- 32
- Repo updated
- First seen
- Licence
- MIT
At a glance
FlatRedBall ColorOperation enum (Add, Modulate, Color, etc.) shared across visual object types.
- Game Development work in your project
- SKILL.md covers Where it lives and Gotchas
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Color Operations is an agent skill from vchelaru/FlatRedBall. FlatRedBall ColorOperation enum (Add, Modulate, Color, etc.) shared across visual object types. Triggers: ColorOperation, mColorOperation, Sprite.ColorOperation, RenderableIpso, RenderableSkiaObject, AnimationFrame.ColorOperation, UpdateVertexColorsAccordingToAlpha.
Its SKILL.md is about 800 tokens, which your agent loads only when the skill is triggered. It is a single SKILL.md file with no bundled scripts.
It sits in Game Development. The repository describes itself as: Cross-platform 2D game engine focused on ultimate productivity built in .NET. The licence is MIT.
When your agent uses it
- Game Development work in your project
Example prompts
- “/color-operations”
What it can do on your machine
Read from SKILL.md and the folder at commit fa654ab. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Color Operations loads about 798 tokens when it runs. Until then it costs about 71 tokens; SKILL.md has 288 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
The full file from vchelaru/FlatRedBall at commit fa654ab, republished under its MIT licence (© vchelaru). 288 words, ~798 tokens.
Download SKILL.mdSave it as
.claude/skills/color-operations/SKILL.md (or your agent's skills folder).- name
- color-operations
- description
- FlatRedBall ColorOperation enum (Add, Modulate, Color, etc.) shared across visual object types. Triggers: ColorOperation, mColorOperation, Sprite.ColorOperation, RenderableIpso, RenderableSkiaObject, AnimationFrame.ColorOperation, UpdateVertexColorsAccordingToAlpha.
Where it lives
ColorOperation enum: Engines/FlatRedBallXNA/FlatRedBall/Graphics/GraphicalEmumerations.cs.
It's not Sprite-specific — consumers include:
| Type | File | Notes |
|---|---|---|
Sprite | Engines/FlatRedBallXNA/FlatRedBall/Sprite.cs | Full support, all enum values; setter calls UpdateVertexColorsAccordingToAlpha |
AnimationFrame | Engines/FlatRedBallXNA/FlatRedBall/Graphics/Animation/AnimationFrame.cs | Nullable per-frame override, applied in Sprite.UpdateToAnimationFrame |
RenderableSkiaObject (Gum/SkiaSharp text, SVG) | Engines/SkiaGum/Renderables/RenderableSkiaObject.cs | Hardcoded to Modulate, read-only — does not respect Add/Subtract/etc. |
Renderer global state | Engines/FlatRedBallXNA/FlatRedBall/Graphics/Renderer.cs | Static ColorOperation property drives shader technique selection via _effectManager.GetVertexColorTechniqueFromColorOperation |
Gotchas
- Skia-rendered objects (Text/Gum via
RenderableSkiaObject) silently ignore non-Modulate operations — theIRenderableIpso.ColorOperationgetter always returnsModulate, there's no setter. Don't expectAdd/Subtract/etc. to work outside the XNASpriterender path. - Debug-only platform restriction: on iOS/Android/WinRT, setting
Sprite.ColorOperationtoAdd,Subtract,InterpolateColor,InverseTexture,Modulate2X, orModulate4Xthrows in DEBUG builds (Sprite.cs~line 410) — these ops aren't guaranteed cross-platform. "AddSigned"is notColorOperation.AddSubtract. It's a separate legacy string op-code handled only inGraphicalEnumerations.SetColors(GraphicalEmumerations.cs~line 293), which biasesdesiredRed/Green/Blueby-127.5and remaps to plain"Add"— no enum value, noVertexColorPackerinvolvement.ColorOperation.Texturewith a nullTexturebehaves likeColorOperation.Color(seeRenderer.cs~line 3349,Sprite.cs~line 256) — a common "why does my untextured sprite still show color" trip-up.Sprite.Red/Green/Blueclamp to[-1, 1], not[0, 1](Sprite.cs~line 301-304), and nothing downstream re-clamps before GPU upload. Packing (nowVertexColorPacker.Pack, called fromSpriteManager.cs~line 2146) casts the float channel touintvia(uint)(255 * value). A negative float→uint cast here is undefined behavior per ECMA-335 (out-of-range float-to-unsigned conversion is unspecified) and is genuinely runtime-dependent, not just "clamps to 0": on .NET 8/x64 (this repo's actualnet8.0target) it wraps to byte129; on .NET 10 the same code gives0. Either way it is NOT a clean subtraction — never rely on negativeRed/Green/BlueunderColorOperation.Addto produce predictable output; useColorOperation.AddSubtractinstead (bias/scale-encodes the signed value so it survives the UNORM byte round-trip predictably).
© vchelaru, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file
Files
Just SKILL.md in .claude/skills/color-operations of vchelaru/FlatRedBall.
Open the folder on GitHubat commit fa654ab
Compare with similar skills
Color Operations next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Color Operations this skillvchelaru/FlatRedBall | 578 | — | ~798 | Automated safety check: Pass | MIT | |
| Image to Three.js Modelimg2threejs/img2threejs | 18k | 1 repos | ~8.2k | Automated safety check: Pass | Apache-2.0 | |
| Web CloneJane-xiaoer/claude-skill-web-clone | 1k | 1 repos | ~2.7k | Automated safety check: Pass | MIT | |
| Threejs Game Directormajidmanzarpour/threejs-game-skills | 2.5k | — | ~2.2k | Automated safety check: Pass | MIT | |
| Game Asset Generatorhtdt/godogen | 7.1k | — | ~2.8k | Automated safety check: Pass | MIT | |
| Threejs Gameplay Systemsvalkor-ai/loom | 1.2k | 1 repos | ~1.4k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Color Operations
What does Color Operations do?
FlatRedBall ColorOperation enum (Add, Modulate, Color, etc.) shared across visual object types. Color Operations is an agent skill from vchelaru/FlatRedBall.) shared across visual object types.
When should I use Color Operations?
Color Operations fits situations like: game Development work in your project.
How do I install Color Operations in Claude Code?
Run `npx skills add vchelaru/FlatRedBall --skill color-operations -a claude-code`. Or copy the skill folder (.claude/skills/color-operations in vchelaru/FlatRedBall) into .claude/skills/color-operations in your project. Claude Code loads it when a task matches its description.
How do I install Color Operations in Codex?
Run `npx skills add vchelaru/FlatRedBall --skill color-operations -a codex`. Or copy the skill folder (.claude/skills/color-operations in vchelaru/FlatRedBall) into .agents/skills/color-operations in your project. Codex loads it when a task matches its description.
Can I use Color Operations in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add vchelaru/FlatRedBall --skill color-operations -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/color-operations, .gemini/skills/color-operations, .github/skills/color-operations and .opencode/skills/color-operations in your project.
What does Color Operations need to run?
SKILL.md names no scripts, command-line tools or credentials: Color Operations is instructions for the agent only.
Does Color Operations access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Color Operations safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Color Operations use?
Color Operations is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.
How many tokens does Color Operations use?
About 798 tokens (SKILL.md is roughly 3.2k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full.
What are the alternatives to Color Operations?
Skills that share tags, products or a category with Color Operations: Image to Three.js Model (img2threejs/img2threejs, 18k stars), Web Clone (Jane-xiaoer/claude-skill-web-clone, 1k stars), Threejs Game Director (majidmanzarpour/threejs-game-skills, 2.5k stars) and Game Asset Generator (htdt/godogen, 7.1k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Color Operations?
vchelaru (a GitHub user) maintains it in vchelaru/FlatRedBall, which has 578 GitHub stars. The repository holds 32 skills in this directory. The repository was last updated on October 10, 2026.
Source: vchelaru/FlatRedBall on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.