{"id":1127,"date":"2012-09-30T00:46:11","date_gmt":"2012-09-29T21:46:11","guid":{"rendered":"http:\/\/unitycoder.com\/blog\/?p=1127"},"modified":"2021-07-20T23:35:00","modified_gmt":"2021-07-20T20:35:00","slug":"marching-cubes-voxel-terrain","status":"publish","type":"post","link":"https:\/\/unitycoder.com\/blog\/2012\/09\/30\/marching-cubes-voxel-terrain\/","title":{"rendered":"Marching Cubes Voxel Terrain"},"content":{"rendered":"

\"\"<\/a><\/p>\n

Marching cubes terrain sculpting v2.0 (this is also based to the earlier webgl port<\/a>)<\/p>\n

Current Features:<\/strong>
\n– Can add \/ remove ground
\n– Special shader for blending materials (based on world Y)
\n– Moved raycasting to camera, can add multiple chunks (but they are not “connected” to neighbours yet)
\n– Chunks are now connected to neighbours (bubblegum solution: each chunk has list of neighbours in array, based on name+x+y+z..)<\/p>\n

TODO:<\/strong>
\n– Try INT version (creates blocky graphics like minecraft..?)
\n– Find better terrain UV mapping or shader techniques.. (texture atlas? texture painting? world slope based textures?)
\n– Custom collision system, instead of mesh collider?
\n– Save the mesh from play-mode to asset..
\n– Brush size adjusting..
\n– Display brush on terrain.. (using projector?)
\n– Try explosions? Dirtball?<\/p>\n

References:<\/strong>
\n– Marching cube system is based on this earlier test: http:\/\/unitycoder.com\/blog\/2012\/09\/25\/marching-cubes-javascript\/<\/a>
\n– Terrain shader is modified version of this: http:\/\/answers.unity3d.com\/questions\/54313\/shader-rgb-colour-based-on-y-value-vertex.html<\/a>
\n– Textures are from: http:\/\/opengameart.org<\/a><\/p>\n

Webplayer:<\/strong>
\nhttp:\/\/unitycoder.com\/upload\/demos\/VoxelTerrain1\/<\/a> (v2.0)
\nhttp:\/\/unitycoder.com\/upload\/demos\/VoxelTerrainUnity3\/<\/a> (v3.0)<\/p>\n

*Source is available here:
\nhttps:\/\/unitycoder.com\/blog\/2016\/12\/24\/voxel-terrain-js\/<\/a><\/p>\n

—<\/p>\n

Notes for 3.0:<\/strong><\/p>\n

worldroot (empty game object) has script CreateWorld
\nparameters:
\nChunk: chunk prefab
\nsize: (is actually resolution, if its too high will hit 65k vertices error), for example 16 seems fine.
\naxismin: 0 (chunk pivot from 0)
\naxismax:8 (chunk width 8 units)
\nsizex and sizez: 16×16 means 16*16 chunks side by side.<\/p>\n

main terrain script is in the prefab VoxelMesh
\n“MarchingCubesJ.js”<\/p>\n

some variables on the script:
\nnoiseScale: adjust this when creating perlin terrains
\nstrength, addStrength: digging and terrain adding strengths<\/p>\n

functions:
\n– InitChunkPerlin() fills\/creates the chunk, in this place you can create more interesting chunks.<\/p>\n

For example can use this function instead (and change noiseScale to 0.1), (might need a 2 sided shader).<\/p>\n

\n function InitChunkPerlin3D()\n {\n var terrainHardness:int = 4; for (var z:int = 0; z lt; size; z++) \/\/ z - blue { for (var y:int = 0; y lt; size; y++) \/\/ y - green { for (var x:int = 0; x lt; size; x++) \/\/ x - red { var offX:int = x+offset.x; var offY:int = y+offset.y; var offZ:int = z+offset.z; var vx:float = axisMin + axisRange * x \/ (size -1); var vy:float = axisMin + axisRange * y \/ (size -1); var vz:float = axisMin + axisRange * z \/ (size -1); points.Add(Vector3(vx,vy,vz)); var value:float = p.Noise(offX*noiseScale,offY*noiseScale,offZ*noiseScale); if (y==0) value=terrainHardness*10000; \/\/ bottom is capped if (y==size-1) value=terrainHardness*10000; \/\/ top also values.Add(value); } } } }\n<\/pre>\n
Screenshot of what is included (v3.0)<\/strong>
\n\"\"<\/a>< Click to view image<\/p>\n
Info:<\/strong>
\n– Try the Webplayer demo 3.0<\/a> to see the current features (and bugs<\/strong>!)
\n– Main difference to that: This download version uses perlin noise terrain (Perlin.cs included)
\n– There are MANY bugs, for example: Setting chunk size & resolution only works with certain values..
\n– Feel free to ask more info
\n—<\/p>\n
Image#2<\/strong>: Testing multiple chunks, somehow they should affect the neighbours (to connect the surfaces).. not sure yet how..<\/p>\n
\"\"<\/p>\n
—<\/p>\n
Image#3<\/strong>: Big Map (50 x 50 chunks, each chunk is 120 x 120 x 120 meters..) [click image to view full size]<\/p>\n
\"\"<\/a><\/p>\n
—<\/p>\n
Image#4:<\/strong> Current version (28.10.2012) (click to view full size)<\/em>
\n– Chunks now connect properly, also while editing chunk borders
\n– Terrain can be generated with perlin noise<\/p>\n
\"\"<\/a><\/p>\n
—<\/p>\n
Image#5:<\/strong> Current version (3.11.2012) (click to view full size)<\/em>
\n– This one is using 2D Mathf.PerlinNoise, instead of Perlin.cs, had some problems connecting chunks..<\/p>\n
\"\"<\/a><\/p>\n
—<\/p>\n
Image#6<\/strong>: Current version (3.11.2012) (click to view full size)<\/em>
\n– Now its possible to use heightmap texture and build it as a voxel chunks terrain (still some leaks at chunk borders)<\/p>\n
\"\"<\/a><\/p>\n
—<\/p>\n
Image#7:<\/strong> Current version (4.11.2012) (click to view full size)<\/em>
\n\"\"<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Marching cubes terrain sculpting v2.0 (this is also based to the earlier webgl port) Current Features: – Can add \/ remove ground – Special shader for blending materials (based on world Y) – Moved raycasting to camera, can add multiple chunks (but they are not […]<\/p>\n","protected":false},"author":1,"featured_media":1128,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":true,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[4,3],"tags":[286,18,309,342,144,314,313,312,168,311],"class_list":["post-1127","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-demos","category-unity3d","tag-caves","tag-javascript","tag-marching-cubes","tag-marching-squares","tag-minecraft","tag-mountains","tag-ridges","tag-sculpting","tag-terrain","tag-voxel"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/unitycoder.com\/blog\/wp-content\/uploads\/2012\/09\/marching_cubes_voxel_terrain_unity1.jpg?fit=680%2C390&ssl=1","jetpack_shortlink":"https:\/\/wp.me\/p1KTaT-ib","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1127","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/comments?post=1127"}],"version-history":[{"count":32,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1127\/revisions"}],"predecessor-version":[{"id":5392,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/posts\/1127\/revisions\/5392"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media\/1128"}],"wp:attachment":[{"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/media?parent=1127"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/categories?post=1127"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unitycoder.com\/blog\/wp-json\/wp\/v2\/tags?post=1127"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}