sms: simulation tweaks

sms/libsms/src/springmasssystem.cpp

@@ -5,7 +5,7 @@
 #include "sms/spring.h"
 
 /*static*/
-const float SpringMassSystem::DAMPING = 0.95f;
+const float SpringMassSystem::DAMPING = 0.98f;
 
 /*static*/
 void SpringMassSystem::link(Mass * mass0, Mass * mass1, Spring * spring) {

sms/sms/src/main.cpp

@@ -15,7 +15,7 @@ void init_sm_system3(SpringMassSystem * system);
 GLuint load_texture(const std::string & filename);
 
 int main(int argc, char ** argv) {
-    const double UPDATE_RATE = 1.0f / 5000.0f;
+    const double UPDATE_RATE = 1.0f / 3000.0f;
     QApplication app(argc, argv);
     SpringMassSystem sms0, sms1;
     init_sm_system3(&sms0);
@@ -82,7 +82,7 @@ void init_sm_system2(SpringMassSystem * system) {
         system,
         Vector(-5.0f, 10.0f), Vector(5.0f, 0.0f),
         W, 5,
-        1.0f, 10.0f);
+        1.0f, 30.0f);
     (*system->masses())[0].set_fixed(true);
     (*system->masses())[W - 1].set_fixed(true);
 }

sms/sms/src/smscreator.cpp

@@ -177,7 +177,9 @@ void SMSCreator::create_crossed_flag(
         for(unsigned int x = 0; x < x_masses - 1; ++x) {
             link(x    , y, x + 1, y    , INCREMENT.x());
             link(x    , y, x    , y + 1, INCREMENT.y());
+            spring_it->set_k(k * 0.05f);
             link(x    , y, x + 1, y + 1, INCREMENT_LENGTH);
+            spring_it->set_k(k * 0.05f);
             link(x + 1, y, x    , y + 1, INCREMENT_LENGTH);
         }
         link(x_masses - 1, y, x_masses - 1, y + 1, INCREMENT.y());