Fixing spring simulations and some write ups

1 files changed, 16 insertions, 0 deletions

diff --git a/2d/softbody/softbody_1/snippet2.cpp b/2d/softbody/softbody_1/snippet2.cpp
new file mode 100644
index 0000000..0e8523e
--- /dev/null
+++ b/2d/softbody/softbody_1/snippet2.cpp
@@ -0,0 +1,16 @@
+
+struct Spring {
+    float mass = 1.f;       // Mass of the weight on the end of the spring
+    float k = 4;            // Spring Constant, in N / m
+    float c = 1;            // Viscous damping constant, in N / m/s
+    float force = 0.f;
+    float velocity = 0.f;
+    float position = 0.f;
+};
+
+void updateSpring(Spring* spring, float dtSeconds) {
+    spring->force = spring->c * spring->velocity + spring->k * spring->position;
+    float acceleration = spring->force / spring->mass;  // F = ma
+    spring->velocity = spring->velocity + acceleration * dtSeconds;
+    spring->position = spring->position + spring->velocity * dtSeconds;
+}