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Fast Weather Simulation for Inverse Procedural Design of 3D Urban Models

This is the source code for our paper Fast Weather Simulation for Inverse Procedural Design of 3D Urban Models by Ignacio Garcia-Dorado, Daniel Aliaga, Saiprasanth Bhalachandran, Paul Schmid, and Dev Niyogi, accepted in ACM Transactions on Graphics TOG (12/2016). For more details about this project, please refer to our weather simulation project webpage.

Abstract

We present the first realistic, physically-based, fully coupled, real-time weather design tool for use in urban procedural modeling. We merge designing of a 3D urban model with a controlled long-lasting spatiotemporal interactive simulation of weather. Starting from the fundamental dynamical equations similar to those used in state-of-the-art weather models, we present a novel simplified urban weather model for interactive graphics. Control of physically-based weather phenomena is accomplished via an inverse modeling methodology. In our results, we present several scenarios of forward design, inverse design with high-level and detailed-level weather control and optimization, as well as comparisons of our method against well-known weather simulation results and systems.

Platforms

Linux (tested on Ubuntu) and Windows (tested on Windows 10) are currently supported but it should work with any platform that compiles C++.

Instalation

The only requirement is GCC/G++. In Ubuntu, the default installed version (including live usb) should work. In Windows, we have used Visual Studio.

Compilation (Ubuntu)

To run, just compile all cpp files with C++11 flags (this is not a hard constraint), and run the code.

$ g++ *.cpp *.h -std=c++11 -o weather
$ chmod +x weather
$ ./weather

Compilation (Windows)

We have tested using Visual Studio 2010 and 2013. Just create a project that includes all files and run.

Usage

The default run demo:

  1. Load the initial weather state from a sounding. Note: We include code to load two types of sounding files.
  2. Load the ground variables. Here we randomly assign to each bottommost gridcell a land use, and then, we populate the ground variables from the provided files (Supplemental Material B). Note: In our implementation, we load this from images but here it is random to avoid to have additional dependencies.
  3. All the variables are initialized.
  4. The system runs 1000 iterations.

Files

The main files are:

  • WeatherMain: Contains the main class that runs the simulation. First, the simulation variables are defined (e.g., dT, grid size), then the ground variables are initialized, and the initial state initialized from a sounding, finally, the simulation is executed.
  • Weather3D: Contains simulateStep that runs one or more steps of the simulation. In each step, the fundamental equations, microphysics, radiation, and move in time are executed.
  • Grid3D: Contains the 3D structure (as a 1D vector) that holds the simulation variables and the access patern.
  • Ground3D: Contains the structure (as a 1D vector) that holds the ground simulation variables and the access patern. Since it represents the bottommost gridcells, it is just a 2D structure.
  • RadStruct: Contains a structure that is used by the radiation model (e.g., day of the year, time of the day).
  • sounding_0: Contains an example of weather sounding from University of Wyoming. This file is used to initialize the Grid3D.
  • landuse_constants: Contains the land use variables used in the simulation (Supplemental Material B).

License

Code of the paper: Fast Weather Simulation Coupled with Inverse Procedural Design of 3D Urban Models This project is licensed under the MIT license

Copyright (c) 2011-2016 Ignacio Garcia-Dorado, Daniel Aliaga.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.