# Dynamic Radial Masks [**Dynamic Radial Masks (DRM)**](https://assetstore.unity.com/packages/vfx/shaders/dynamic-radial-masks-144845?aid=1011lvgVb) is a shader extension for Unity, calculating world-space volumetric 3D spherical masks in a variety of forms, shapes and amounts directly inside a shader. Calculated result is a mask, value of *float* type, which inside shader can be used for interpolating one material value into another, vertex displacement, discarding mesh fragments, creating hit and impact, rain drops, ripples, sonar and many others effects.

Force Field

Season Change

Sonar Effect

Water Ripples

Rain Drops

Worlds Transition

**DRM** is a shader extension and it needs to be manually integrated into a shader, made by **Shader Graph**, [**Amplify Shader Editor**](https://assetstore.unity.com/packages/tools/visual-scripting/amplify-shader-editor-68570?aid=1011lvgVb) or hand-written HLSL file. And it is quit easy. **DRM** integrates into **Shader Graph** and [**Amplify Shader Editor**](https://assetstore.unity.com/packages/tools/visual-scripting/amplify-shader-editor-68570?aid=1011lvgVb) using just one node. That's all. No other shader coding is required:
Output result of the DRM node is a mask, value of *float* type. In this example, it is connected to the **Base Color** block for demonstrating volumetric 3D spherical mask it creates:
One DRM node can contain up to 200 mask objects. Output result is a combination of all those masks as a one *float* value. Example below demonstrates ripple effect, create by one DRM node consisting of 64 objects:
**DRM** can calculate and render volumetric 3D spherical masks of 8 shapes:

Torus

Tube

Height Field

Dot

Shockwave

Sonar

Rings

Ripple

Inside shader can be used multiple DRM nodes of various shapes and counts, each one for different purposes and effects. For example, shaders in the scene below use 2 DRM nodes - one for blending winter/summer textures and another node is used for sonar effect:
Total number of spherical masks that can be calculated inside one shader depends on the target device’s GPU and how many shader instructions it can handle. For PC and modern consoles it may be hundreds of **DRM** projections, but for mobile devices it is much less. DRM node consists of multiple complex properties (world-space position of mask objects, their radius, intensity, noise strength, etc) that are not editable in shader and visible inside material editor, instead those properties are updated using controller script.