lightBgAmbDiff Library Method
Short Description: Set background color, ambient and diffuse factors
Signature: t.lightBgAmbDiff (backgroundColor, ambientFactor, diffuseFactor, a0, a1)
Group: Texture
Class: transition Class
Defines the ambient and diffuse reflection factors, background color, and transparency.
The diffuse factor specifies the amount of light coming directly from the light source and reflected
by the object. If the object direclty faces the light source, it receives the full diffuse
light specified here. If it turns away or if it is shadowed,
it gets less or even no diffuse light. The amibient reflection models the light
the object receives from other light sources or via multiple reflections.
It always receives light according to the ambient factor specified here, regardless of the objects position.
If the ambient factor is 1.0 and diffuse factor is 0.0, the animated HTML element
shows up as is, regardless of its position. If the two factors add up to 1.0 and if the
light source is in front of the page (which is roughly the default), then the animated HTML
element shows up as is but gets darker if it is rotated away.
If the sum of ambient and diffuse color is less than 1.0, then the animated HTML element
becomes darker. If the sum of ambient and diffuse factor is more than 1.0, then the HTML
element becomes lighter, however since a screen cannot
show lighter colors than white, this does not really look good.
If the method is not used, default values as specified in taccgl.Lighting Parameters are taken.
Using lightBgAmbDiff you can only specify grayscale factors as ambient and diffuse colors.
If you need other colors, use lightAmbDiff.
The following examples specify a red background color to demonstrate that it does not show
up. The background color is of relevance only if the HTML element is (partially) transparent.
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",0.0,1.0,0,0).start(); | RUN |
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",1.0,0.0,0,0).start(); | RUN |
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",0.3,0.7,0,0).start(); | RUN |
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",0.7,0.3,0,0).start(); | RUN |
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",0.7,0.7,0,0).start(); | RUN |
taccgl.actor("Layout").rotateMiddle(0,1,0).dur(7).lightBgAmbDiff("red",0.3,0.3,0,0).start(); | RUN |
The methods color, lightAmbDiff, and lightBgAmbDiff are mutually
exclusive, only one of them can be used for a single transition. lightBgAmbDiff
sets the specified background color with the specified alpha value a0 (0 means transparent ... 1 fully visible).
The parameter backgroundColor must not specify a transparent color.
If the second alpha value a1 is given, an animation from the first to the second value is performed.
Note that the background color is relevant, only if the HTML element is transparent. But if this
is the case, it can be important to show some kind of background.
Examples
taccgl.texClearAll(); var a=taccgl.actor("para").rotateMiddle(0,1,0).dur(7); a.position(a.x,a.y-100,0); a.lightBgAmbDiff("red",0.3,0.7,0,0).start(); | RUN |
taccgl.texClearAll(); var a=taccgl.actor("para").rotateMiddle(0,1,0).dur(7); a.position(a.x,a.y-100,0); a.lightBgAmbDiff("red",0.3,0.7,1,1).start(); | RUN |
taccgl.texClearAll(); var a=taccgl.actor("para").rotateMiddle(0,1,0).dur(7); a.position(a.x,a.y-100,0); a.lightBgAmbDiff("red",0.3,0.7,1,0).start(); | RUN |
taccgl.texClearAll(); var a=taccgl.actor("para").rotateMiddle(0,1,0).dur(7); a.position(a.x,a.y-100,0); a.lightBgAmbDiff("red",0.3,0.7,1,0).blend(1,0,0,0).start(); | RUN |
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3D Animation
