Created
March 13, 2020 07:03
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Thermal diffusion algirothm
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| void DiffusingHeatMap::_physics_process(float delta) | |
| { | |
| clearBackBuffer(); | |
| for(int yy = 0; yy < mapSize; ++yy) | |
| { | |
| for(int xx = 0; xx < mapSize; ++xx) | |
| { | |
| diffuse(xx, yy); | |
| } | |
| } | |
| swapBackBuffer(); | |
| } | |
| void DiffusingHeatMap::diffuse(int x, int y) | |
| { | |
| const float heat = map[y][x]; | |
| constexpr float DIVISOR = 8.0f; // The number of sides it can defuse to | |
| const float diffuse = heat / DIVISOR; | |
| int numDiffused = 0; | |
| // Top Left | |
| numDiffused += diffuseCell(x - 1, y + 1, heat, diffuse); | |
| // Top Center | |
| numDiffused += diffuseCell(x, y + 1, heat, diffuse); | |
| // Top Right | |
| numDiffused += diffuseCell(x + 1, y + 1, heat, diffuse); | |
| // Center Left | |
| numDiffused += diffuseCell(x - 1, y, heat, diffuse); | |
| // Center Left | |
| numDiffused += diffuseCell(x + 1, y, heat, diffuse); | |
| // Top Left | |
| numDiffused += diffuseCell(x - 1, y - 1, heat, diffuse); | |
| // Top Center | |
| numDiffused += diffuseCell(x, y - 1, heat, diffuse); | |
| // Top Right | |
| numDiffused += diffuseCell(x + 1, y - 1, heat, diffuse); | |
| // Set the new value for this voxel | |
| // We subtract all of the heat that was diffused to other cells | |
| backBuffer[y][x] = map[y][x] - (heat / DIVISOR) * (float) numDiffused; | |
| } | |
| int DiffusingHeatMap::diffuseCell(int x, int y, float heat, float diffuse) | |
| { | |
| int diffused = 0; | |
| if(rangeCheck(x, y) && map[y][x] < heat) | |
| { | |
| backBuffer[y + 1][x + 1] = map[y + 1][x + 1] + diffuse; | |
| diffused = 1; | |
| } | |
| return diffused; | |
| } | |
| bool DiffusingHeatMap::rangeCheck(int x, int y) | |
| { | |
| return x >= 0 && y >= 0 && x < mapSize && y < mapSize; | |
| } |
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