IceCube_Blender 3D.pdf

Blender Shaders :

Ice cube

Document Created by CyaNn, 2004

http://caron.yann.free.fr

yann.creations@free.fr

Special thanks to dgebel for his greate syntax correction (very difficult with me ;))

http://www.freewebs.com/nogenius

I.Workspace

I think to simplify making good artwork, it's important to have a good global vision of what you are

working on. Blender has a very

customizable workspace which makes it easy to do this.

It's simple to join or split a window, just right-click on a window border and select your desired

option.

As well, you can use [ctrl] + [leftArrow] or [ctrl] + [rightArrow] navigate into different

workspaces, or select the workspaces from the

drop-down list (called Datablocks in the tooltip help)

Use the menu item, "File/Save default setting" to save your workspace settings.

I have made a file with workspace panels on my website that you can download.

Download http://caron.yann.free.fr/tutBlender/Shaders/IceCube/Sources/.B.blend

Install it in your blender program root/.blend directory.

II.Shader

II.1Material

First I set color and alpha like on the image.

Then, on the Ramps tab, click to activate colorband, and

set two colors :

Left : white, alpha 0

Right : LightBlue, alpha 0.27

Important! Set Input to Result and Method to Add

Input sets the ramp calculation formula. On result

calculates the ramp from Shader, Lighting, and object

normals

For this shader, there is nothing really difficult. I used

an intense specularity with high value of spec and high

hardness.

Hardness concentrates the light impact.

Here I use translucency to permit light to pass throught

mater and be transmitted to the back of the object. For

example white paper backlighted.

The most important setting for this shader, the ray

tracing parameters, are set on panel Mirror Transp.

As ice is a little reflective, I set a small mirror value to

reflect environment. Fresnel permit to decrease the

effect on object center.

Ray transp is the most important setting for this shader,

I set a high IOR value to render a strong diffraction

effect, which is

characteristic of ice. Normally this value must be set to

1.309 (cf. Chapter III, Index of refraction) but I usually

prefer to set the

value according to what I see rather set real values. It's

up to you.

Next, click on Ray on the Render Buttons panel [F10]

II.2Textures

I use a light cloud to set displacement. It

permits you to change the object geometry.

White points move up along the normal, and

black points move down the normal.

Displacement is really useful to make complex

object details without modeling everything.

When using displacement don't forget to set

Normal value to 0

For bump, like displacement, I choose a cloud

procedural texture.

The differences between bump and displacement

is that bump doesn't change geometry. It just

changes the render point normals to simulate

roughness. Render point normals directly

influence specularity and surface lighting.

Now add a stucci texture to give a little grain on

the bump map.

Now make a mask to apply little bump (next

texture) only in certain places.

To make this I use the stencil option on the

texture.

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