Now you see me

- Fix entities sometimes freezing when they first appear.
- Fix bounding sphere calculation for multiple combined meshes.
- Fix shadow bounding sphere transformer outputting incorrect radius.

src/main/java/com/jozufozu/flywheel/backend/engine/indirect/IndirectModel.java

@@ -32,6 +32,9 @@ public class IndirectModel {
 	public void write(long ptr) {
 		MemoryUtil.memPutInt(ptr, 0); // instanceCount - to be incremented by the cull shader
 		MemoryUtil.memPutInt(ptr + 4, baseInstance); // baseInstance
-		boundingSphere.getToAddress(ptr + 8); // boundingSphere
+		MemoryUtil.memPutFloat(ptr + 8, boundingSphere.x()); // boundingSphere
+		MemoryUtil.memPutFloat(ptr + 12, boundingSphere.y());
+		MemoryUtil.memPutFloat(ptr + 16, boundingSphere.z());
+		MemoryUtil.memPutFloat(ptr + 20, boundingSphere.w());
 	}
 }

src/main/java/com/jozufozu/flywheel/lib/model/ModelUtil.java

@@ -114,6 +114,7 @@ public final class ModelUtil {
 		int baseVertex = 0;
 		for (Mesh mesh : meshes) {
 			vertexList.ptr(block.ptr() + (long) baseVertex * PosVertexView.STRIDE);
+			vertexList.vertexCount(mesh.vertexCount());
 			mesh.write(vertexList);
 			baseVertex += mesh.vertexCount();
 		}

src/main/java/com/jozufozu/flywheel/lib/visual/EntityVisibilityTester.java

@@ -45,9 +45,16 @@ public class EntityVisibilityTester {
 	public boolean check(FrustumIntersection frustum) {
 		AABB aabb = entity.getBoundingBoxForCulling();
 
-		boolean visible = adjustAndTestAABB(frustum, aabb);
+		// If we've never seen the entity before assume its visible.
+		// Fixes entities freezing when they first spawn.
+		// There might be a more sound solution to that, but this works.
+		boolean visible = lastVisibleAABB == null;
 
-		if (!visible && lastVisibleAABB != null && lastVisibleAABB != aabb) {
+		if (!visible) {
+			visible = adjustAndTestAABB(frustum, aabb);
+		}
+
+		if (!visible && lastVisibleAABB != aabb) {
 			// If the entity isn't visible, check the last visible AABB as well.
 			// This is to avoid Entities freezing when the go offscreen.
 			visible = adjustAndTestAABB(frustum, lastVisibleAABB);

src/main/resources/assets/flywheel/flywheel/instance/cull/shadow.glsl

@@ -1,5 +1,5 @@
 void flw_transformBoundingSphere(in FlwInstance i, inout vec3 center, inout float radius) {
     // We can just ignore the base center/radius.
     center = i.pos + vec3(i.size.x * 0.5, 0., i.size.y * 0.5);
-    radius = max(i.size.x, i.size.y) * 0.5;
+    radius = length(i.size) * 0.5;
 }