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The VRayDecal provides an easy way to project one material on top of another regardless of the target UV set. The projected material is placed in an adjustable VRayDecal gizmo that controls its size, placement and projection limits in the Viewport.

Multiple VRayDecals can be stacked on top of each other and their overlapping is controlled by the parameters in each VRayDecal object or by their positions in the scene.

The VRayDecal’s effect is visible at render time only.

UI path: ||Command panel|| > Create tab > Geometry > V-Ray Category > VRayDecal button

1. Create a VRayDecal gizmo and place it in the viewport on top of the surface you want to project the new material on.
2. Create a material from the Material Editor or just pick a ready made material from the V-Ray Material Library Browser and assign it to the VRayDecal.
3. Adjust the size and angle of the VRayDecal.

Enabled – Enables the use of VRayDecal.

Preview – When enabled, a preview of the material assigned to the VRayDecal is shown in viewport.

Width – Specifies the width of the VRayDecal gizmo.

Length – Specifies the length of the VRayDecal gizmo.

Fit aspect ratio to bitmap – Оpens a browser window where a bitmap image can be selected and used to resize the VRayDecal based on that bitmap aspect ratio.

Fit aspect ratio to material – Resizes the VRayDecal to match the aspect ratio of the first eligible texture (bitmap) in the assigned material. Note that procedural textures are ignored.

Projection depth Height – Specifies the height of the VRayDecal gizmo.

Normal angle – Specifies the angle to which the decal is applied onto the surface below.

Fade out – Enables the use of a fade out angle.

Fade out angle – Specifies the angle where the decal effect fades out, e.g. if set to 45, the minimum fade out angle value is 45 and the maximum fade out angle value is up to 180. By default the Fade out angle value equals the Normal angle value and can't be set to be lower than the Normal angle value.

Order – Specifies a layering order when multiple VRayDecal gizmos are present. The decal with the larger Order value is set on top of the other ones. In case of equal Order values, the bounding boxes of the decals are taken into account for positioning.

Mask – Masks the projected material based on a texture. The material must be applied to the VRayDecal.

Back Side – Enables projection on back face. Note that if the result from the VRayDecal is not immediately visible, further adjusting of the Normal angle parameter is needed.

Exclude – Specifies a list of objects that are not affected by the VRayDecal.

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