U World

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RAW

Obsidian: [[12-01-01-LevelDesign]] [[10-01-01-U_PCG]]

Fog > bloom > exposure > white balance > contr brig sat > tonemapping > gamma (gammma works only on LDR)

World Partition

OFPA pipeline - One File Per Actor. (Unlike the old world comp system)

Cells are streamed

  • Cell size - można zmienić później determin gird size to stream - default is 25600 «< can prev grid in world details for larfge worlds vomponent resolution is bigger 511x511 to reduce draw calls

Cell loading range

  • Grid size -
  • World partition + HLOD (bake geo for background)
  • Level Instances

Landscape

Heightfields

verts (res) Quads / section SUBSections Component size Total Landscape Components
32767     max res without tiles  
8129 x 8129 127 4 254 1024 (32x32)
4033 x 4033 63 4 126 1024 (32x32)
2017 x 2017 63 4 126 256 (16x16)
1009 x 1009 63 4 126 64 (8x8)
1009 x 1009 63 1 63 256 (16x16)
505 x 505 63 4 126 16 (4x4)
505 x 505 63 1 63 64 (8x8)
253 x 253 63 4 126 4 (2x2)
253 x 253 63 1 63 16 (4x4)
127 x 127 63 4 126 1
127 x 127 63 1 63 4 (2x2)

Export

Only loaded 511 / 1021 < includ vert edges export on streaming proxies

Calculating Heightmap Z Scale

 height range is a total of 512 units  -256 cm and 255.992, stored with 16-bit precision  then multiplied by the Z scale value that you input when you import the heightmap data.

512 units * 40 scale = 20480 20480 cm * 0.001953125 = 40 scale 204,8 m * 0.1953125 = 40 scale

512 units * 50 scale = 25600

Landmass: https://youtu.be/GwJiN8LLnQI?t=1230

Virtual texture & displacement

  1. create rtv x2.
    • change one texture to height
  2. create RVT volume actor,
    • bounds align actor, probe landscape and setbounds
  3. select landscape and add 3 draw in virtual tex slots.

Displacement

  1. \Config\DefaultEngine.ini
    • r.Nanite.AllowTessellation=1
    • r.Nanite.Tessellation=1
  2. Enable in material
  3. in editor console
    • r.Nanite.AllowTessellation 1
    • r.Nanite.Tessellation 1
  4. Enable Nanite in landscape & rebuild data

Water

Create water

  • water manager
  • water body ocean » tell water brush
  • water brush > passing h map info about changes to water mesh
  • water mesh > mesh surface itself
  • water bodies > r.Water_WaterMEsh.ShowTileBounds 1
  • make a hole in surface: https://youtu.be/d5Ft7UaYayM?t=1667

HLOD

Regen HLOD

World map sizesz Apex - 3.6 Fortnite (ch1) - ~6.7km^2
GTA III - 8km^2 L.A Noire ~21km^2 The Elder Scrolls V: Skyrim ~37km^2
GHTA SA - 38 PUBG - 64 RDR2 - 75 GTA 5 80

Fluid Flux

Create enviro

BP_FluxSimulationDomain BP_FluxModifierSourceActor BP_FluxSurface_Water

Create staic mesh

  • select surface
  • Procedural mesh editor [x]
    1. component should apear: surfaceProceduralMesh > GENERATE MESH (pivot same as in sim)