Trapcode Particular

Visibility

The Visibility group controls where particles are visible in the composition. For example, particles far away can be set to fade out, which is great for simulating fog. There is also an option to use a Z buffer from another layer, which lets you work in conjunction with a Z Buffer imported from a separate 3D modeling program.

The Visibility section also holds Obscuration settings that can be used to make layers obscure the particles.

At left, the full Visibility group. At right, a diagram of how Visibility works in Particular.

Far Vanish

The far distance from the camera when particles become completely invisible. Low values mean the particles are farther away and become invisible. High values mean the particles are closer and stay visible.

Left to right, Far Vanish set low and high.

Far Start Fade

The far distance from the camera when particles start to fade out. Low values make the fade apply itself. High values keep the fade from happening.

Left to right, Far Start Fade set low and high.

Near Vanish

The near distance from the camera when particles become completely invisible. Low values mean the particles are closer and stay visible. High values mean the particles are farther away and become invisible. (The opposite functionality of the Far Vanish parameter.)

Left to right, Near Vanish set low and high.

Near Start Fade

The near distance from the camera when particles start to fade out. Low values keep the fade from happening. High values make the fade apply itself. (The opposite functionality of the Far Start Fade parameter.)

Left to right, Near Start Fade set low and high.

Near and Far Curves

The curve used to fade particles in the Near and Far Fade zones. Can be Linear or Smooth .

Z Buffer

Z Buffer lets you select a 2D, comp-sized, lightness-based, linear layer to use as a Z-buffer.

A Z-buffer contains per-pixel depth values. Typically, Z-buffering stores the Z-axis value of each pixel. This holds information about the distance from the camera viewpoint for each pixel.

Z-buffering can be useful when particles are to be inserted into a scene from a 3D application (like Cinema 4D). The 3D app can be configured to output a Z Buffer. (This is also known as Depth Map or Depth Buffer.) If the Z Buffer is not anti-aliased leaving it a bit rough on the object edges, it often won’t matter if the particles are small and moving quickly.

Z at Black

Controls what depth (distance to camera) a completely black pixel in the Z Buffer means.

Z at White

Controls what depth (distance to camera) a completely white pixel in the Z Buffer means.