Filament Math Agent Skill
> Enforce correct mathematical primitives and naming conventions in Filament code. Use this skill when performing coordinate transformations, vector math, or projection setups.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/google/filament --skill filament-mathThe instruction itself
3 sections, as written by the authorFilament Mathematical Primitives and Naming Conventions
Filament provides its own set of math primitives optimized for graphics. Avoid importing external library formats (like GLM, Eigen, or raw DirectX math structures) unless explicitly requested.
1. Approved Math Types
All math constructs must reside in the filament::math namespace:
- Vectors:
-
math::float2(2D float vectors) -
math::float3(3D float vectors) -
math::float4(4D float vectors) -
math::half3/math::half4(half-precision float vectors) -
math::int2/math::int3/math::int4(integer vectors) - Matrices:
-
math::mat3f(3x3 float matrix) -
math::mat4f(4x4 float matrix) - Rotations:
-
math::quatf(quaternion rotation)
2. Naming and Manipulations
- Use standard operators (
+,-,*,/) between math components. - Avoid raw float pointers or C-style array indices. Use the built-in constructors or indexing operators:
// Correct
math::float3 position(0.0f, 1.0f, 2.0f);
float x = position.x; // or position[0]
- When transforming vectors via matrices, ensure proper dimensional multiplication order:
math::mat4f transform = ...;
math::float4 homogeneousVec(position, 1.0f);
math::float4 transformed = transform * homogeneousVec;
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How to use it
Take google/filament-math from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.