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Proj Deferred Decal

A proj deferred decal is a deferred decal projected onto a surface by means of perspective projection.

Notice
Changing of the projection pyramid location relatively to the projection surface changes the size of the decal in accordance with the laws of perspective.

When the human eye views a scene, objects in the distance appear smaller than objects close by - this is known as perspective.

Perspective Projection

While orthographic projection ignores this effect to allow accurate measurements, perspective definition shows distant objects as smaller to provide additional realism.

Perspective Projection Pyramid

See Also

  • A DecalDeferredProj class to edit proj deferred decals via UnigineScript
  • A decal_deferred_base material to be applied to the decal
  • A set of samples located in the data/samples/decals/ directory:
    1. deferred_proj_00
    2. deferred_proj_01

Creating a Projected Deferred Decal

To create a projected deferred decal choose an Add Deferred Decal option in the list of nodes in Editor panel. In the opened creation dialog window choose the Proj tab and specify initial parameters:

Creation Window
Material A material of the decal.
Radius The height of the projection pyramid along the Z axis, in units.
Field of View The field of view of the decal's projector, in degrees.
Aspect The aspect ratio of the decal, in units.

After the initial parameters are set, press Ok button and place the decal on the existing surface (for the decal to be projected, the projection box should intersect the surface):

Placement of the Projected Deferred Decal

Editing a Projected Deferred Decal

In the Decal tab you can adjust the following parameters of the projected deferred decal:

A Decal tab

Setting Bit Masks

A set of bit-masks available for the decal:

Decal A mask of the decal, specifying the objects onto which the decal can be projected.
Light A light mask, specifying light sources illuminating the decal.
Viewport A viewport mask, specifying if the decal can be seen in the camera's viewport.

Projection Parameters

Parameters of the decal projection:

Radius The height of the projection pyramid along the Z axis, in units.
Field of View The field of view of the decal's projector, in degrees.
Aspect The aspect ratio of the decal, in units.
ZNear The value of the near clipping plane, ranging from 0 to 1.

Life-time Parameters

Life-time and fade-out parameters:

Life time A time period during which the decal will be projected, in seconds.
Fade time A time period during which the decal will fade away (after its life time exceeds), in seconds.

Visibility Parameters

Parameters controlling decal's visibility depending on the distance:

Min visible A minimum visibility distance, starting at which the decal begins to fade in and then becomes completely visible, in units.
Fade A minimum fade-in distance, across which the decal smoothly becomes visible due to the alpha fading. It is counted starting from the minimum visibility distance value, in units.
Max visible A maximum visibility distance, starting at which the decal begins to fade out until becomes completely invisible, in units.
Fade A maximum fade-out distance, across which the decal smoothly becomes invisible due to the alpha fading. It is counted starting from the maximum visibility distance value, in units.

Texture Coordinates Transformation

Decal's texture coordinates transformation (a texture atlas can also be used):

ScaleX A texture scale along the X-axis. For example, by the scale of 2 the texture is repeated twice on one decal.
TranslateX A texture offset along the X-axis. For example, by the offset of 0.5 along the X axis the texture is repositioned to the right (so that the edge of the texture is rendered in the center).
ScaleY A texture scale along the Y-axis.
TranslateY A texture scale along the Y-axis.

Setting a Material

A material selection:

Material A new material of the decal.
Last update: 2017-07-03