# Tutorial #3 - Bullet Holes {% embed url="" %} In the previous tutorials we have created DMR shaders consisting of only one mask object, but DRM node can calculate a compound mask consisting of multiple objects. {% stepper %} {% step %} Open DRM editor window and choose **HeightField** for shape and set **Count** to 32:

{% endstep %} {% step %} Click on the **Shader Graph** button and drag and drop generated DRM node into shader editor and connect its output to the **Base Color**:

{% hint style="info" %} Mask objects count calculated inside a node is written in its name (same as all other DRM settings). {% endhint %} {% endstep %} {% step %} That's all. Now this DRM node will calculate compound mask consisting of 32 masks. It works exactly the same way as DRM node with 1 mask. {% endstep %} {% step %} Create a new material using this shader and assign it to a mesh. {% endstep %} {% step %} Create **DRM Controller** script with the same **DRM Settings** as used by DRM node and add new material to its **Materials** array. Set **Pool** to **Game Objects** and create several **DRM Game Objects**:

{% endstep %} {% step %} Each mask object has its own visual settings (world-position, radius, intensity, etc) and they are adjusted individually from the **DRM Game Object**. {% hint style="danger" %} Note, shader performance directly depends on the mask objects count used by the DRM node. Changing the **Count** property inside the **DRM Controller** script or **DRM Game Objects** count in the Pool doesn't mean calculating less or more masks inside a shader. Used mask objects count is baked inside DRM node and it cannot be changed from a script. In this example, the DRM node inside shader always calculates a compound mask that consists of 32 objects. If a DRM node with fewer mask objects is needed, then an appropriate DRM node should be generated using the DRM editor window and it must be used inside the shader. **DRM Settings** inside the **DRM Controller** script always have to be the same as DRM node settings inside a shader that it updates. {% endhint %} {% endstep %} {% step %} For creating holes in the mesh, enable **Alpha Clipping** for the shader and use DRM node output for **Alpha** block. Keep **Alpha Clip Threshold** value to 0.5:

{% hint style="info" %} Note, output value of the DRM node in this example needs to be inverted. In this case holes will be created inside spherical gizmos. {% endhint %}

{% endstep %} {% step %} For creating even better bullet holes effect add Emission (HDR Color) and a noise:

{% endstep %} {% endstepper %} **DRM Game Objects** are created by hand inside editor or instantiated at run-time, and then manually added to the **Pool**. Visual properties of each mask object can be controlled and animated inside editor or during run-time. For simplifying this process DRM package includes **DRM Live Object** class - this is a run-time generated object with self animatable DRM visual properties and automatic destruction system. We can use it for generating bullets. In the **DRM Controller** switch **Pool** to the **Live Objects** and add **DRM On Mouse Raycast** script to a mesh using the 'bullet holes' material:

{% hint style="info" %} **DRM On Mouse Raycast** generates **DRM Live Object** on every successful [Physics.Raycast](https://docs.unity3d.com/ScriptReference/Physics.Raycast.html) event and adds it the **DRM Controller** pool. Import Examples package (from **Amazing Assets** → **Dynamic Radial Masks** → **ReadMe** file) if **DRM On Mouse Raycast** script is missing. {% endhint %} In this example generated **DRM Live Objects** have life length of 10 secs after which they are automatically destroyed (removed from the **Pool**). Radius of each one varies between 0.2 - 0.5. Enter game mode and click on the mesh: {% embed url="" %} Bullet holes example scene is included in the package {% endembed %} DRM node used in this shader calculates mask consisting of 32 objects. During run-time inside **DRM Controller** can be checked their current count in the Pool: