9.40 Snow

Superimposes a particle effect simulating falling snow on to the scene. The snow particle is given as a small image, typically a 50x50 png file (transparency supported).

9.40.1 Parameters

Parameters

Default

Range

Description

ParticleImage

-

n/a

The full path of the particle image. Specifying this parameter is mandatory.

NumParticles

500

> 0

The number of particles present at any given time

ParticleSize

0.04

> 0

The normalized size of the particle with respect to the screen

ParticleAvgDurationSecs

5.0

> 0

The duration of each particle measured in seconds

Alpha

0.7

[0.0,1.0]

The transparency of each particle. This parameter can be animated with a nice fade-in and fade-out effect

Motion

2

{0,1,2,3}

0: The particles fall straight down
1: The particles follow a sine curve while falling down
2: The particles follow a sine and cosine curve while falling down
3: The particles follows a parametric curve that causes the flakes to gall in bursts

ParticleFlicker

1

{0,1}

If set to 1, the size of the particles will vary slightly as it falls down. Else the various particle size will remain static. Do note that the initial particle size is itself slightly randomized so that particle sizes are different at creation time

Input pattern: ()

Image-Op: No

9.40.2 Examples

9.40.2.1 Adding snow particles on top of the user image

; muSE v2
;
; My super awesome style.
; It adds snow on top of our user image.

(style-parameters)

(segment-durations 8.0)

(define muvee-global-effect (effect-stack
                                 (effect "CropMedia" (A))
                                 (effect "Perspective" (A))
                                 (layers (A)
                                          A
                                          (effect "Snow" ()
                                                  (param "ParticleImage" (resource "SnowParticle.png"))))))

The snow image "SnowParticle.png" that we provided to the effect is displayed below -

9.40.2.2 GreenPepper example

The example is an abuse of the snow effect :) There is nothing that is preventing us from adding a completely different image of our own liking to the snow effect. In this example, I have added a small green pepper image to the snow effect.

; muSE v2
;
; My somewhat funny style.
; Adding falling green peppers on top of our user image.

(style-parameters)

(segment-durations 8.0)

(define muvee-global-effect (effect-stack
                                 (effect "CropMedia" (A))
                                 (effect "Perspective" (A))
                                 (layers (A)
                                         A
                                         (effect "Snow" ()
                                                 (param "ParticleImage" (resource "GreenPepper.png"))
                                                 (param "Motion" 0)
                                                 (param "ParticleFlicker" 0)
                                                 (param "Alpha" 0.98)
                                                 (param "ParticleSize" 0.1)))))

The snow image "GreenPepper.png" that we provided to the effect is displayed below -

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1	License
2	Getting Started
3	Style Package Structure
4	Anatomy of a muvee
5	Tutorials
6	Specifying Style Behaviour
7	About effects and transitions
8	Sound effects
9	List of primitive effects and transitions
10	Show Time - the muvee timeline
11	Utility functions
12	A Gentle Introduction to mu SE
	Index

9.1	Alignment
9.2	Alpha
9.3	Blur
9.4	Blur Layers
9.5	Cg
9.6	Color Quad
9.7	Color Map RGB
9.8	Color Select
9.9	Crop Media
9.10	Cross Fade
9.11	Desaturate
9.12	Distort
9.13	Flip
9.14	Fragment Program
9.15	Gradient Fade
9.16	Gradient Fade_ Color Border
9.17	Greyscale
9.18	Height Map
9.19	Light
9.20	Look At
9.21	Mask
9.22	Material
9.23	Moving Polygons
9.24	Old Movie Lines
9.25	Old Movie Scratches
9.26	Page Curl
9.27	Perspective
9.28	Picture Quad
9.29	Radial Blur
9.30	Rapid Overlay
9.31	Reflect
9.32	Reflect And Ripples
9.33	RGBto YUV
9.34	Rotate
9.35	Saturate
9.36	Scale
9.37	Seamless Background
9.38	Sepia
9.39	Shatter
9.40	Snow
9.41	Text Out
9.42	Texture Subset
9.43	Translate
9.44	Vertex Program
9.45	Volumetric Lights

Parameters	Default	Range	Description
ParticleImage	-	n/a	The full path of the particle image. Specifying this parameter is mandatory.

NumParticles	500	> 0	The number of particles present at any given time

ParticleSize	0.04	> 0	The normalized size of the particle with respect to the screen

ParticleAvgDurationSecs	5.0	> 0	The duration of each particle measured in seconds

Alpha	0.7	[0.0,1.0]	The transparency of each particle. This parameter can be animated with a nice fade-in and fade-out effect

Motion	2	{0,1,2,3}	0: The particles fall straight down 1: The particles follow a sine curve while falling down 2: The particles follow a sine and cosine curve while falling down 3: The particles follows a parametric curve that causes the flakes to gall in bursts

ParticleFlicker	1	{0,1}	If set to 1, the size of the particles will vary slightly as it falls down. Else the various particle size will remain static. Do note that the initial particle size is itself slightly randomized so that particle sizes are different at creation time