Graphics Reference
In-Depth Information
Getting ready
Start Blender and open the
9931OS_09_volumelight_start.blend
file, where there is
a scene set with a ground Plane, a Cube, the volumetric cone mesh (volume_light), a spot
mesh object (spot_mesh), and an effective Spot lamp parented to the volume_light. The Spot
lamp cone follows the shape of the volume_light, and its purpose is to light the Cube leaning
on the ground Plane.
The volume light objects also have a brief animation of 98 frames. To see it, move the Time
Cursor inside the Timeline window; to point the cone of light to the Cube, go to frame 81.
How to do it...
Let's go ahead with creating the light cone material:
1. Select the volume_light object and click on the New button in the Node Editor
window toolbar, or in the Material window under the main Properties panel to
the right. Rename the material as
volume_light
.
2. In the Material window, switch the Diffuse BSDF shader node with a Mix Shader
node. Label it as
Mix Shader1
.
3. In the first Shader slot of the Mix Shader1 node, select a new Mix Shader node.
Label it as Mix Shader2. In the second Shader slot, select a Transparent BSDF
shader node.
4.
Go to the Mix Shader2 node, and in the first Shader slot, select a Mix Shader
node again (Mix Shader3). Connect the output of the Transparent BSDF node to
the second Shader slot of the Mix Shader2 node.
5.
Go to the Mix Shader3 node, and in the first Shader slot, select one more
Mix Shader node (label it
Mix Shader4
). Connect the output of the Transparent
BSDF node to the second Shader slot.
6.
Go to the Mix Shader4 node, and in the first Shader slot, select one Emission node.
Connect the output of the Transparent BSDF node to the second Shader slot of the
Mix Shader4 node.
7.
Set the color values of the Emission node for R to
0.769
, G to
0.800
, and B to
0.592
. Then set the Fac value of Mix Shader4 to
0.800
.
8.
Add a Layer Weight node (press
Shift
+
A
and navigate to Input | Layer Weight)
and connect its Facing output to the Fac input socket of the Mix Shader3 node.
Set the Blend value to
0.900
.
