Transparent Cutout Specular
Reference Manual > Built-in Shader Guide > Transparent Cutout Shader Family > Transparent Cutout Specular

Transparent Cutout Specular

One consideration for this shader is that the Base texture's alpha channel defines both the Transparent areas as well as the Specular Map.

Transparent Cutout Properties

This shader is an alternative method of displaying transparent objects. The fundamental differences between this shader and a regular Transparent shader are:

This shader uses an alpha channel contained in the Base Texture to determine the transparent areas. If the alpha contains a blend between transparent and opaque areas, you can manually determine the cutoff point for the which areas will be shown. You change this cutoff by adjusting the Alpha Cutoff slider in the Inspector.

Specular Properties

This shader is a Pixel-Lit shader, which is more expensive than Vertex-Lit. Pixel lighting is expensive mostly because each object has to be drawn multiple times for each pixel light that shines on it. Vertex lights don't affect the shader in this way. Pixel lights support cookies, bumpmapping, and shadows while vertex lights do not. Pixel lights are also much less sensitive to tesselation of the models - if you have a cube using this shader, you can put point light very close to its surface and it will have nice round highlight. This effect cannot be achieved with Vertex lighting.

Specular computes the same simple (Lambertian) lighting as Diffuse, plus a viewer dependent specular highlight. This is called the Blinn-Phong lighting model. It has a specular highlight that is dependent on surface angle, light angle, and viewing angle. The highlight is actually just a realtime-suitable way to simulate blurred reflection of the light source. The level of blur for the highlight is controlled with the Shininess slider in the Inspector.

Additionally, the alpha channel of the main texture acts as a Specular Map (sometimes called "gloss map"), defining which areas of the object are more reflective than others. Black areas of the alpha will be zero specular reflection, while white areas will be full specular reflection. This is very useful when you want different areas of your object to reflect different levels of specularity. For example, something like rusty metal would use low specularity, while polished metal would use high specularity. Lipstick has higher specularity than skin, and skin has higher specularity than cotton clothes. A well-made Specular Map can make a huge difference in impressing the player.


Generally, this shader is moderately expensive to render. For more details, please view the Shader Peformance page.