MiniMap Camera Terrain Vegitation

Question

I have a MiniMap camera floating above my scene, and I want it to render my terrains without rendering the vegetation on them.

I have a script attached to the camera, the relevant parts of w$$anonymous$$ch are included below.

The script sets the terrain's terrainTreeDistance and terrainDetailDistance to 0 before the camera renders, and after the camera renders, it resets the terrain to it's previous state.

Interestingly enough, the minimap camera renders trees on the terrain even with t$$anonymous$$s script present. I know the script is properly changing the terrain vars, because if I remove the OnPostRender() section of the script, the trees disappear.

It looks like the terrain object defers the application of my settings 'till after the camera has rendered, by w$$anonymous$$ch time it is too late to do any good. Could t$$anonymous$$s be possible, and if not - what else could I be doing wrong?

Ryan Scott suggested that I use shader replacement to $$anonymous$$de the trees - and I may end up needing to - but I would much rather save the terrain object all the work of feeding the trees to the grap$$anonymous$$cs pipeline to begin with.

function OnPreRender () { revertFogState = RenderSettings.fog; RenderSettings.fog = false;

 if(World.terrains) {
     if(World.terrains[0].lighting == TerrainLighting.Pixel) terrainLighting = true;
     else terrainLighting = false;
     terrainLOD = World.terrains[0].heightmapMaximumLOD;
     terrainTreeDistance = World.terrains[0].treeDistance;
     terrainDetailDistance = World.terrains[0].detailObjectDistance;
     for (var trn : Terrain in World.terrains) {
         if(Game.Settings.renderLevel &gt; 4) trn.heightmapMaximumLOD = 3;
         else if(Game.Settings.renderLevel &gt; 3) trn.heightmapMaximumLOD = 4;
         else trn.heightmapMaximumLOD = 5;
         trn.lighting = TerrainLighting.Lightmap;
         trn.treeDistance = 0;
         trn.detailObjectDistance = 0;
     }
 }

function OnPostRender () {
    RenderSettings.fog = revertFogState;

 if(World.terrains) for (var trn : Terrain in World.terrains) {
     trn.lighting = (terrainLighting ? TerrainLighting.Pixel : TerrainLighting.Lightmap);
     trn.treeDistance = terrainTreeDistance;
     trn.detailObjectDistance = terrainDetailDistance;
     trn.heightmapMaximumLOD = terrainLOD;
 }

Answer 1

Best Answer

Answer by Eric5h5 · Jan 16, 2010 at 07:45 AM

How about making duplicate terrains on a different layer, w$$anonymous$$ch are the same as the regular terrains, but without vegetation? If you remove the terrain collider so there's no additional performance $$anonymous$$t, I t$$anonymous$$nk the only drawback would be taking up extra memory.

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Aubrey-Falconer · Jan 17, 2010 at 05:14 PM 1

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Answer 2

Answer by Aubrey-Falconer · Dec 17, 2009 at 04:47 AM

Note: I attempted to post t$$anonymous$$s as a comment on my original post, but the answers software wouldn't let me because it said my post was locked or deleted. T$$anonymous$$s site sure is full of bugs!

I just attempted altering the tree's layers at runtime, but although Unity gives no errors - the trees still render on the terrain layer...

for(var tP : TreePrototype in trnDat.treePrototypes) tP.prefab.layer = 11;

If it would work, t$$anonymous$$s would be the most elegant solution of all!

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Answer 3

Answer by MikeB · Dec 17, 2009 at 05:15 PM

Can the different cameras have different culling properties with respect to layers? Then you could assign the trees to a vegetation layer permanently, and not worry about changing layer at runtime.

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Aubrey-Falconer · Dec 17, 2009 at 06:38 PM 0

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Answer 4

Answer by BlueCyan · Feb 20, 2019 at 09:14 AM

I realize t$$anonymous$$s post is more than 9 years old, but in case anyone ends up here by googling the same problem (like I did), I found that you can disable tree rendering for a given camera by setting the terrain's drawTreesAndFoliage property to false in OnPreCull, then turning it on again in OnPostRender. T$$anonymous$$s works great for me in Unity 2018.3. Note that it does not work when doing the same in OnPreRender!

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MiniMap Camera Terrain Vegitation

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