export default /* glsl */` #ifdef USE_MORPHNORMALS // morphTargetBaseInfluence is set based on BufferGeometry.morphTargetsRelative value: // When morphTargetsRelative is false, this is set to 1 - sum(influences); this results in normal = sum((target - base) * influence) // When morphTargetsRelative is true, this is set to 1; as a result, all morph targets are simply added to the base after weighting objectNormal *= morphTargetBaseInfluence; objectNormal += morphNormal0 * morphTargetInfluences[ 0 ]; objectNormal += morphNormal1 * morphTargetInfluences[ 1 ]; objectNormal += morphNormal2 * morphTargetInfluences[ 2 ]; objectNormal += morphNormal3 * morphTargetInfluences[ 3 ]; #endif `;