SVG feSpecularLighting Filter
feSpecularLighting simulates a glossy highlight reflecting off a bumpy surface, complementing feDiffuseLighting's matte lighting effect.
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Simulating Glossy Surface Highlights
feSpecularLighting works similarly to feDiffuseLighting, taking a bump map and a light source definition, but instead produces a bright, concentrated highlight simulating how light reflects sharply off a glossy or metallic surface, controlled by specularExponent (highlight tightness) and specularConstant (highlight brightness) attributes.
- Produces a bright, concentrated highlight simulating a glossy surface reflection
- specularExponent controls how tight and focused the highlight appears
- specularConstant controls the overall brightness of the simulated highlight
Combining Specular and Diffuse Lighting for Realism
Compositing an feSpecularLighting result with feDiffuseLighting using feComposite (typically with the arithmetic operator) produces a more physically realistic combined lit surface, since real-world materials exhibit both a diffuse base lighting response and a specular highlight simultaneously rather than just one effect alone.
- Compositing both effects together produces a more physically realistic result
- Real-world materials exhibit both diffuse and specular lighting simultaneously
- feComposite with the arithmetic operator is the typical combination technique
Frequently Asked Questions
Why does my feSpecularLighting result look like a colored blob rather than a subtle highlight?
This usually means the specularConstant or specularExponent values need tuning down, or the result needs to be composited with the original shape using an appropriate blend mode rather than displayed on its own.
Are these lighting filters commonly used for flat icon design?
They're more commonly used for special decorative effects like embossed badges, metallic text, or textured backgrounds rather than typical flat icon design, which usually favors simpler, flatter styling.
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