Games104 Getting Started with Modern Game Engines - Atmosphere and Cloud Rendering in Lecture6 Games

1 Terrain rendering
2 Rendering of trees
3 Decorator Rendering
4 Road Rendering

insert image description here

1 Terrain rendering

insert image description here

insert image description here

LOD:
The terrain is continuous, which is different from GO.

It is related to FOV.
If the screen has the same amount of pixels, the amount of pixels occupied by each triangle will increase under a small fov.

insert image description here
Principle 1: Related to FOV
Principle 2: Error compare to ground truth (pre-computation)

insert image description here
How to make the triangle sparse?

1 Triangle-based subdivison

Always cut the bottom of the isosceles triangle and divide it into two triangles

The highlighted ones are under fov. 135°. The game is generally around 70-80.
insert image description here

This method is efficient, but counterintuitive.
insert image description here

2 QuadTree-Based Subdivision

At present, all quadtrees are used,
and the results are regular, in line with the data specifications, and in line with people's feelings.
insert image description here
Resource management is implied.

degenerate triangle, adsorption,

insert image description here

3 Triangulated Irregular network(TIN)

insert image description here
The number of triangles will be low. It is used for deserts, and rarely used for others.

4 GPU-based tessellation

insert image description here

Mesh Shder

insert image description here

dynamic terrain

insert image description here

5 Non-Heightfield Terrain

insert image description here

6 Voxels - Marching Cubes

insert image description here

7 Coloring the Terrain

insert image description here

Splatting: But there is still a problem. When the camera moves and looks from top to bottom, there will be obvious gaps

Solution: add a bias, 0.2

insert image description here

3D texture: Interpolation will be done between texuters, there is a relationship between
texture arrya: There is no relationship between layers and textures between layers.

insert image description here

Parallax Mapping - Visual only, geometric boundaries are still smooth.

insert image description here

virtual Texture

insert image description here
Core idea: Load the used things into the memory, and throw the unused things on the hard disk. Basically use this.

8 Hardware Development

The files are all compressed and decompressed in the graphics card.
DMA: The graphics card reads directly from the disk and does not write to the memory.

insert image description here