From 3a52fa8cae56c9ff9ea194a959f7469b4db48ef0 Mon Sep 17 00:00:00 2001
From: mattkae <mattkae@protonmail.com>
Date: Thu, 28 Apr 2022 21:10:51 -0400
Subject: WIP

---
 2d/softbody/softbody_2/SpringRectangle.h |  22 ++++++++--------------
 2d/softbody/softbody_2/dist/output.wasm  | Bin 44744 -> 51716 bytes
 2 files changed, 8 insertions(+), 14 deletions(-)

(limited to '2d')

diff --git a/2d/softbody/softbody_2/SpringRectangle.h b/2d/softbody/softbody_2/SpringRectangle.h
index 02e5308..2156314 100644
--- a/2d/softbody/softbody_2/SpringRectangle.h
+++ b/2d/softbody/softbody_2/SpringRectangle.h
@@ -33,8 +33,6 @@ struct SoftbodyRectangle {
     Vector2 springDimensions;
 
 	// Runtime data
-	Vector2 velocity;
-	Vector2 worldPosition;
 	PointMassUpdateData* updateData = NULL;
 	float32 rotationalVelocity = 0.f;
 	float32 rotation = 0.f;
@@ -47,8 +45,7 @@ struct SoftbodyRectangle {
 	Vertex2d* pointsVertices = NULL;
 
 	void load(Renderer2d* renderer) {
-		velocity = Vector2(0, 0);
-	    worldPosition = Vector2(800.f / 2 - width / 2, 400.f);
+		auto worldPosition = Vector2(800.f / 2 - width / 2, 400.f);
 		springDimensions = Vector2(width / springDensity, height / springDensity);
 	    int32 numVertices = springDensity * springDensity; // Each subdivision is a square.
 		int32 numIndices = 6 * ((springDensity - 1) * (springDensity - 1));
@@ -62,10 +59,15 @@ struct SoftbodyRectangle {
 		int32 iIdx = 0;
 		float32 inverseDensity = 1.f / springDensity;
 		float32 halfInv = inverseDensity / 2.f;
+		float32 rotation = PI / 8.f;
 		for (int32 y = 0; y < springDensity; y++) {  // Rows
 			for (int32 x = 0; x < springDensity; x++) { // Columns
-			    Vector2 vpos = Vector2(x * inverseDensity - halfInv, y * inverseDensity- halfInv);
-				// Get the position in mode coordinates
+			    Vector2 vpos = Vector2(
+					x * inverseDensity - halfInv,
+					y * inverseDensity - halfInv
+				);
+				vpos = vpos.rotate(rotation);
+				// Get the position in model coordinates
 				vpos.x = vpos.x * width;
 				vpos.y = vpos.y * height;
 				updateData[vIdx].localPosition = vpos;
@@ -157,12 +159,6 @@ struct SoftbodyRectangle {
 			}
 		}
 
-		// -- Calculate the rotation of the entire body
-		//rotationalVelocity = 0.1f;
-		//auto gravityDt = GRAVITY_ACCELERATION * dtSeconds;
-		//velocity = velocity + gravityDt;
-		//worldPosition = worldPosition + (velocity * dtSeconds);
-
 		// -- Euler integrate and update the local position of each vertex.
 		for (int32 v = 0; v < pointsMesh.numVertices; v++) {
 			auto pointMass = &updateData[v];
@@ -171,8 +167,6 @@ struct SoftbodyRectangle {
 			pointMass->acceleration = pointMass->force / jointMassKg;
 			pointMass->velocity = pointMass->velocity + (pointMass->acceleration * dtSeconds);
 			pointMass->worldPosition = pointMass->worldPosition + (pointMass->velocity * dtSeconds);
-			// pointMass->restingPosition = pointMass->restingPosition.rotateAround(rotationalVelocity * dtSeconds, modelPosition);
-			// pointMass->currentPosition = pointMass->currentPosition.rotateAround(rotationalVelocity * dtSeconds, modelPosition);
 
 			vertices[v].position = pointMass->worldPosition;
 			pointsVertices[v].position = pointMass->worldPosition;
diff --git a/2d/softbody/softbody_2/dist/output.wasm b/2d/softbody/softbody_2/dist/output.wasm
index 98cade0..da27ab7 100755
Binary files a/2d/softbody/softbody_2/dist/output.wasm and b/2d/softbody/softbody_2/dist/output.wasm differ
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