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How Do I Make Volumetric Damage Effects (Blood, Wounds, etc.)?

Hi everyone!

Recently, I saw a Unity marketplace item where you could buy a volumetric blood system (link: https://www.unrealengine.com/marketplace/en-US/product/character-wound-system). In the demo video, a volumetric blood splatter sprayed outwards and landed on the ground, creating a decal the same shape and position as the splatter. I know how to use Niagara to create blood particles, but I do not know how to make them impact the ground as a decal in the same shape as the particles. Example image: image Does anyone know how to achieve that effect? Also, I saw another marketplace post, this time an Unreal post, which provided a system that, when a character is shot or hit, a blood/wound mask will appear on that character’s body, like so:

. Does anyone know how to recreate that also? Thanks in advance!