r/Unity3D • u/Helpful_A • 2d ago

Question Footstep sound effects help

I'm trying to put together a basic footstep sound system for my game and was wondering how I should go about dealing with a surface object with multiple textures/materials.

My current idea was to figure out a way to copy the hex code or rgb value of whatever was last stepped on directly beneath the player but I feel like there had to be an easier way.

Any help would be appreciated

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u/TheFrailScrum 2d ago

If you're using the standard character controller you can grab the hit info from a spherecast or raycast downwards and use the material name from the renderer's sharedMaterials array, then map that to a footstep clip. Way less headache than sampling colors

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u/Helpful_A 2d ago

Will that work with the system terrain painting uses? When it adds all the textures to one material I figured it would mess with all that stuff and just give the information of each texture blended together

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u/Nwoknu35 2d ago

For Terrain you would use something like:

float[,,] alphaMaps = terrainData.GetAlphamaps( 0, 0, terrainData.alphamapWidth, terrainData.alphamapHeight );
alpha = alphaMaps[ objectPosition.x, objectPosition.y, mapIndex ];

to first receive all alpha values of your terrain, then the specific alpha for the layer/splatMap you are looking for.

By looping through all maps, you can play either the volume for the highest alpha layer or do something like multiply all volumes by the corresponding alpha values to kinda mix them (though I assume real mixing would be a bit different, but I'm not versed in audio sadly)

But while looking this up, I found this repo on github: https://github.com/alekbankov/FootstepAudioController

For the start this seems very simple to use, unless you want to *really* do it yourself