snow

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The Snow texture simulates snow that has fallen on a surface. Snow only sticks to parts of the object facing upward, and only if they are not too steeply sloped.

The rest of the object (the part not covered in snow) is rendered using the Surface Color.

Tips and ideas:

• Try combining a Fractal bump map with a Snow color map. The snow will only appear on the peaks and valleys of the bump-mapped surface.
• To simulate windswept snow, rotate the Snow's 3d placement about a horizontal line.
• To make snow appear on all objects in your scene, apply the Snow texture as a transparency map on a white shader, and then layer this shader onto other shaders in the scene.

In the table below, important attributes are listed with their names shown in bold in the description column.

Related nodes

layeredTexture, envCube, envSphere, envSky, envBall, envChrome, bump3d, uvChooser, bump2d, texture2d, ramp, file, cloth, water, stencil, checker, fractal, bulge, grid, mountain, texture3d, projection, cloud, granite, crater, leather, stucco, brownian, solidFractal, marble, wood, rock, defaultTextureList, place2dTexture, place3dTexture

Attributes (24)

depthDecay, eyeToTextureMatrix, normalCamera, normalCameraX, normalCameraY, normalCameraZ, refPointCamera, refPointCameraX, refPointCameraY, refPointCameraZ, refPointObj, refPointObjX, refPointObjY, refPointObjZ, snowColor, snowColorB, snowColorG, snowColorR, surfaceColor, surfaceColorB, surfaceColorG, surfaceColorR, thickness, threshold

Long name (short name)	Type	Default	Flags
depthDecay (dd)	float	5.0
Depth Decay controls how abruptly the snow ends and the rest of the surface begins. Decrease Depth Decay to make the snow quickly fade to the surface color as you move down the slope. Increase Depth Decay to make the surface stay snowy further down, with a more abrupt transition.
eyeToTextureMatrix (e2t)	fltMatrix	identity
The transform to go from eye to texture space (pTx = pEye * matrix). It must come from the 3D placement node.
normalCamera (n)	float3	0.0, 0.0, 1.0
The input normal to perturbate
normalCameraX (nx) float 0.0 The X component of the input normal
normalCameraY (ny) float 0.0 The Y component of the input normal
normalCameraZ (nz) float 0.0 The Z component of the input normal
refPointCamera (rpc)	float3	0.0, 0.0, 0.0
The current reference sample point that has to be shaded
refPointCameraX (rcx) float 0.0 The x component of the current sample position
refPointCameraY (rcy) float 0.0 The y component of the current sample position
refPointCameraZ (rcz) float 0.0 The z component of the current sample position
refPointObj (rpo)	float3	0.0, 0.0, 0.0
The current reference sample point that has to be shaded
refPointObjX (rox) float 0.0 The x component of the current reference sample position
refPointObjY (roy) float 0.0 The y component of the current reference sample position
refPointObjZ (roz) float 0.0 The z component of the current reference sample position
snowColor (sn)	float3	1.0, 1.0, 1.0
Snow Color controls the color of the snow. Normally this is left white. But by using different colors and bump values, you can simulate a range of effects, such as cocoa sprinkled on a cake, or crusts forming on top of cooling lava.
snowColorR (snr) float 0.0 Snow Color red value
snowColorG (sng) float 0.0 Snow Color green value
snowColorB (snb) float 0.0 Snow Color blue value
surfaceColor (su)	float3	0.5, 0.0, 0.0
Surface Color is the color of the surface underneath the snow.
surfaceColorR (sur) float 0.0 Surface Color red value
surfaceColorG (sug) float 0.0 Surface Color green value
surfaceColorB (sub) float 0.0 Surface Color blue value
thickness (tn)	float	1.0
Thickness controls how much the snow blocks out the color beneath it. Set it to 1.0 to make the snow completely opaque. As you decrease Thickness, the snow becomes more transparent so that you can see the Surface Color underneath it.
threshold (th)	float	0.5
Threshold controls how steep the surface has to be before snow will not stick to it. You can think of it as the "slipperiness" of the snow. Decrease Threshold to make the snow stick to steeper parts of the surface.