Real time snow accumulation

NAIMA · Feb 2014

Hi I am just out of curiousity asking if there is any engine out there that allows for a realistic real time snow cumulation in game world effect.

I do not mean a layer overshader of objects that pasts over a white or snow texture according to the mesh orientation but something that increases over time the thickness of snow and cumulates over meshes.

Thats the only I found

http://www.ep.liu.se/ecp/013/007/ecp01307.pdf

ZacD · Feb 2014

For solid meshes in UDK, world position offset would work well and be extremely cheap performance wise.

NAIMA · Feb 2014

Duplicating meshes? Any sample videos?

NAIMA · Mar 2014

So no game engine is yet able to perform this ?

passerby · Mar 2014

Someone already game you a possible solution, use a shader that blends snow into the up-vector, that also does a world position offset in the vertex shader to deform the geometry, than you can drive the material with a multiplier that is hooked in variable that is animated over time.

Der Hollander · Mar 2014

Would ObjectWorldPosition work better? The last time I used Transform World Position, it did not discriminate object space, so the parameters only worked at a given world height, rather than applying a up-vector transform on a per-object basis.

passerby · Mar 2014

Der Hollander wrote: »

Would ObjectWorldPosition work better? The last time I used Transform World Position, it did not discriminate object space, so the parameters only worked at a given world height, rather than applying a up-vector transform on a per-object basis.

i just got the object postion, and used that to offset the value im doing the worldpostion offset by.

Eric Chadwick · Mar 2014

For example

[ame="

http://www.youtube.com/watch?v=Q6h4onjwYDM"]Snow Build-up shader - YouTube[/ame]

BARDLER · Mar 2014

Hope this helps
[ame="

http://www.youtube.com/watch?v=lH6SIFQ0ROE"]UDK Tutorial SnowRock (Z-ax Orientated material) - YouTube[/ame]

NAIMA · Mar 2014

Hi that looks interesting and promising , but do you have a video of ingame performance? like a scene with snow cumulating over time? How would that perform overtime?

passerby · Mar 2014

not expensive at all since all your doing is animating a material parameters with matinee, in the video he uses a time node, but you could simply just animate the needed material paramaters

Real time snow accumulation

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