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.
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The material is projected only on the surfaces within the gizmo.
UI Path: V-Ray menu > Geometry > V-Ray Decal
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Enabled – Enables the use of VRayDecal.
Width – Specifies the width of the VRayDecal gizmo.
Length – Specifies Length – Specifies the length of the VRayDecal gizmo.
Height – Specifies the height of the VRayDecal gizmo.
Lock Aspect Ratio – When enabled the aspect ratio is kept, so changing the Width or Height parameters automatically changes the other parameter.
Fit Aspect Ratio to Bitmap – Оpens a browser window where a bitmap image can be selected and used to resize the Decal based on that bitmap aspect ratio.
Fit Aspect Ratio to Material – Resizes the Decal to match the aspect ratio of the first eligible texture (bitmap) in the assigned material. Note that procedural textures are ignored.
Fit Aspect Ratio to Mask – Resizes the Decal to match the aspect ratio of the bitmap used as a mask. Note that if a material is used, the Fit Aspect Ratio to Material is prioritized.
Fit Aspect Ratio to Displacement – Resizes the Decal to match the aspect ratio of the bitmap used as Displacement Texture. Note that if a material is used, the Fit Aspect Ratio to Material is prioritized.
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. For more information, see the Fade Out Angle example.
Order – Specifies a layering order when multiple V-Ray Decal 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.
Enable Mask – Enables the Mask option.
Mask – Masks the projected material based on a texture. The material must be applied to the V-Ray Decal.
Project on Back – Enables projection on the back face of the surface. Note that if the result from the V-Ray Decal is not immediately visible, further adjusting of the Normal Angle parameter is needed.
Mode – Determines if the objects in the list are Excluded or Included in V-Ray Decal i.e. if the material is projected onto them. You can directly drag and drop objects into the list or use the eyedropper tool to select them.
Displacement Texture – Masks the applied displacement based on a texture. Connect the selected texture to the decal material for the effect to take place.
Displacement Multiplier – Multiplies the strength of the displacement. Please note that global displacement amount (found in Render Settings > Settings > Default Displacement and Subdivision > Amount) overrides the Decal Displacement Multiplier.
Use Only Decal Displacement – When enabled, the original surface displacement is not taken into account.
