DTE tutorial part 6 : A new way of combining the components                                              Feb 2000
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Changing the scale of the Texture Now we've used alpha from the new component in texture A. But the preview window looks quite different : the whole cylinder is dark again! 
Never mind  : we know what to do. We change the scale of our texture.

Click on the green button topleft of texture A  to open the Transformation Tools window. Then put your mousearrow on the center of the top cube and drag to the right till you get about 60 percent. Exit with the check mark to enter the new settings.

The transition from light to dark is lower now, but the texture looks different. 

Texture before scaling Texture scaled at 60 percent
What happened ?    Well, in scaling the texture, we also scale the noise pattern, because it's also a part of the texture. That's why we get a finer pattern on our cylinder.

If we want to adjust only the transition, we'll have to get into the DTE and the noise filter again. 
Leave the Materials lab with the cancel mark ("X")or use Ctrl(Command)-Z to cancel the change to the scale. 


Adjust Noise filter in component 2 If you left the materials Lab , open it up again.
Open up the DTE for texture A and open the Filter Dialog for the second component.

You can open the Filter Dialog by clicking the pebble in the bottom of the DTE or the blue circle in the top righthand corner of the component.

Drag on the graph itself ( left to right to adjust a , up - down to adjust b ).
The faster you drag the larger the change of a or b . The slower you drag the smaller the change of a or b.
You can also drag on the values behind a or b to adjust them separately.

If factor a is higher, the noise pattern will change more quickly from black to white,
while adjusting factor b shifts the change up or down. 
Change a to about 12.3 , b to -0.2 .
Factor c is not in the equation, it has no effect : we don't need to adjust it.

It would be handier if you could enter a numerical here, so it would be consistent with other settings in Bryce, but you can't enter one (yet) : you'll have to drag.
 (Some settings let you enter a value if you double click, some don't. )

 

 


 
Change Colour blending and set colours Leave the DTE with the check mark : the preview looks just like it did when we used 2 textures and the second one scaled up.

Now we'll combine the two components differently to get that 'wet' look, as promised.
Enter the DTE again and click the C and A on the second texture till C is on and A and B are off.
Click on the black triangle to open the colour blending mode selection and select Linear Interpol 2 so it uses the top two colours. 
Alt(Opt)-leftclick the colour circles for the top two colours and set them to black (0 luminosity) and halfgray (128 luminosity).Set the saturation to 0 for both. Ignore Hue or set it to 0.

 


 
Select Procedural Blending
Click on the combination mode Average. A whole list of other modes appears : select Procedural Blend.
What happens is that the alpha component ( Altitude filter, remember) in component 2 applies colour 1(black) at low altitude and colour 2 (gray) at high altitude.
Procedural Blend uses the graylevel of the colours in component 2 to apply the colour from component 1 to the combination.
 
 
The final combination
Where the colour from component 2 is darker ( luminosity less than 128) the colour of the first component will appear more saturated in the combination .

Where it is over 128 , the colour of the first component will appear lighter. 
At exactly 128, it will remain unchanged.

Bump information from component 1 is not affected.

Procedural Blend will also blend in the colours from component 2 into the combination. We set them to gray and black so the colour from component 1 would remain the same.

If you find the 'wetter' part too saturated, change the top colour from black to a lighter darkgray till you like it.
 

Why did we switch off Alpha ? Because we don't use it.
The Alpha information defines where colour 1 and colour 2 is applied in component 2, but it is not affecting the COMBINATION directly.
If you want to test this for yourself, change the luminosity of both colours to 128 : the colour in the COMBINATION will be equal to
component 1.
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