pushing

tests/fluidsim.cpp

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+#include "../util/sim/fluidsim.hpp"
+#include "../util/timing_decorator.cpp"
+
+int main() {
+    fluidSim sim;
+    
+    // Simulation settings
+    const int TOTAL_FRAMES = 100000;
+    const int WIDTH = 800;
+    const int HEIGHT = 600;
+
+    // Setup Camera
+    Camera cam;
+    cam.origin = Eigen::Vector3f(0.0f, 400.0f, -1800.0f); // Back and slightly up
+    cam.direction = (Eigen::Vector3f(0.0f, 0.0f, 0.0f) - cam.origin).normalized(); // Look at center
+    cam.up = Eigen::Vector3f(0.0f, 1.0f, 0.0f);
+    cam.fov = 60.0f;
+
+    // Base particle template
+    fluidParticle baseParticle;
+    baseParticle.velocity = Eigen::Vector3f::Zero();
+    baseParticle.acceleration = Eigen::Vector3f::Zero();
+    baseParticle.forceAccumulator = Eigen::Vector3f::Zero();
+    baseParticle.pressure = 0.0f;
+    baseParticle.viscosity = 8.0f;
+    baseParticle.restitution = 200.0f;
+
+    std::cout << "Starting Fluid Simulation..." << std::endl;
+
+    for (int frameIdx = 0; frameIdx < TOTAL_FRAMES; ++frameIdx) {
+        
+        // --- Spawning Logic ---
+        // Spawn throughout the simulation (e.g., until 90% completion)
+        if (frameIdx % 10 == 0) {
+            if (frameIdx < (TOTAL_FRAMES * 0.9f)) {
+                float t = static_cast<float>(frameIdx) / (TOTAL_FRAMES * 0.9f);
+                
+                // Linear interpolation for Mass: Heavy (10.0) -> Light (0.5)
+                float currentMass = (1.0f - t) * 10.0f + t * 0.5f;
+                
+                // Linear interpolation for Size: Large (12.0) -> Small (2.0)
+                float currentSize = (1.0f - t) * 12.0f + t * 2.0f;
+
+                // Number of particles to spawn this frame (can increase as they get smaller)
+                int spawnCount = 2 + static_cast<int>(t * 4); 
+
+                sim.spawnParticles(baseParticle, spawnCount, currentSize, currentMass);
+            }
+        }
+
+        // --- Physics Step ---
+        sim.applyPhysics();
+
+        // --- Render & Save ---
+        if (frameIdx % 50 == 0) {
+            std::cout << "Rendering Frame " << frameIdx << " / " << TOTAL_FRAMES << std::endl;
+            
+            // Generate LODs for faster/better rendering
+            sim.grid.generateLODs();
+
+            // Render frame
+            frame renderedFrame = sim.grid.renderFrame(cam, HEIGHT, WIDTH, frame::colormap::RGB, 4, 4, true, false);
+            
+            // Save to BMP
+            std::stringstream ss;
+            ss << "output/frame_" << std::setw(4) << std::setfill('0') << frameIdx << ".bmp";
+            BMPWriter::saveBMP(ss.str(), renderedFrame);
+            sim.grid.printStats();
+        }
+    }
+
+    std::cout << "Simulation Complete." << std::endl;
+    FunctionTimer::printStats(FunctionTimer::Mode::ENHANCED);
+    return 0;
+}