haoyi-duan/Open_City

“OpenCity” Game Project

• Developed the “OpenCity” inspired by the game “SimCity”

• Rendered images within the OepnGL framework

• patent no.: 2022SR0805651, 2021, Copyright Protection Center of China

A short demo video:

intro.mp4

Project Content

Simple 3D modeling and realistic rendering

Basic Requirements

1. Based on OpenGL, it has the modeling and rendering ability of basic voxels (eg. cube, sphere, cylinder, cone, polyhedral prism).

2. It has the import and export ability for basic 3D mesh ('obj' format).

3. Have the ability to display and edit basic materials and textures, including material maps, diffuse maps, specular maps, normal maps, displacement textures, etc;

4. Basic geometric transformation functions (rotation, translation, scaling, etc.);

5. Basic lighting model functions and light source editing. In the project, we realized the multi-light source rendering of parallel light, point light and spotlight.

6. Roam the scene after modeling, such as Zoom in/out, Pan, Orbit, Zoom To Fit and other observation functions

7. Shader depth detection to achieve fog effect;

8. Various particle systems.

9. gamma correction

10. hdr correction

11. Sky Box with Rotation

sky.box.mp4

Additional Realization of this Project

1. Real time collision detection is available when roaming (AABB bounding box).

2. The lighting model is refined. Realize PCF real-time shadow mapping and water wave displacement texture.

How to Play

Game Start

Use visual studio 2017 (or other supported visual studio versions) to open Open_City\vsbuild\vsbuild.sln, then compile and run in the Realse mode.

Due to the large obj files loaded in the program, the memory requirements are high. If the bad alloc problem occurs during the operation, it may be caused by insufficient memory. It is recommended to run the program on a computer with 16GB or more of memory.

Enter the Initial Interface of the Game

Enter ENTER on the interface to enter the game.

Keys and Mouse Settings

• Players control character movement through W/A/S/D

• Move mouse to switch the view angle

• Slide mouse wheel to achieve zoom in/out

• shift can realize movement acceleration

• Press key 1/2 to switch the perspective (first person perspective, God roaming perspective)

• Press key Q/E enable/disable parallel lighting

• Press key O/P to open/close gamma correction

• Press key K/L to open/close hdr correction

• Press key U/I to turn on/off shadow

• Press key H/J to open/close fog effect switch

• Press key N/M to turn on/off point light source

• Press key V/B to turn on/off spotlight

• Press key 3/4 to open/close destroy mode, in which any object ran into the player will be destroyed

• Press key 5/6 to open/close the function to restore the damaged

• Press key 7 to open/close snowflake particle effect

• Press key 8 to open/close raindrop particle effect

• Press key 9 to open/close fireworks particle effect

• Press key 0 to open/close fountain particle effect

• Press key R/T to open/close construction mode

  When the construction mode is enabled, you can click right mouse button to switch the model. Select the construction position by movement through W/A/S/D, and click left mouse button to confirm the construction.

Demonstration

Point Light Source

Spot Light

spot.light.mp4

Real-Time Shadows

real.time.shadows.mp4

Particle Systems

Fog Effect

• without Fog Effect

  

• with Fog Effect

  

• Video Demonstration

fog_1.mp4

Water Wave

• Shadows of Objects Nearby

water1.mp4

• Reflective Effect Changes with Angle Changes

water2.mp4

Particle Systems

Snowflare, raindrop, fireworks, and fountain, respectively.

particle.system.mp4

Construction Mode

Group Members

Haoyi Duan

Chenning Tao

Zhengtao Xu

References

Learning Materials

LearnOpenGL CN (learnopengl-cn.github.io)

Model Recourses

https://free3d.com/

https://www.turbosquid.com/

https://www.aigei.com/

Water Wave Texture Reference

https://youtu.be/HusvGeEDU_U

Particle Effect Reference

https://blog.csdn.net/dcba2014/article/details/52290521

https://learnopengl-cn.github.io/06%20In%20Practice/2D-Game/06%20Particles/