changed rotation of orbs and discs based on their heading

src/main/java/kamkeel/npcs/client/renderer/RenderAbilityDisc.java

@@ -4,6 +4,8 @@ import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
 import kamkeel.npcs.entity.EntityAbilityDisc;
 import net.minecraft.entity.Entity;
+import net.minecraft.util.Vec3;
+import noppes.npcs.util.MathUtil;
 import org.lwjgl.opengl.GL11;
 
 /**
@@ -51,6 +53,16 @@ public class RenderAbilityDisc extends RenderEnergyAbility {
             GL11.glRotatef(90.0f, 1.0f, 0.0f, 0.0f);
         }
 
+        double motionX = entity.motionX;
+        double motionY = entity.motionY;
+        double motionZ = entity.motionZ;
+        Vec3 motionVec = Vec3.createVectorHelper(motionX, motionY, motionZ);
+
+        float motionYaw = MathUtil.getYaw(motionVec);
+        float motionPitch = MathUtil.getPitch(motionVec);
+        GL11.glRotatef(motionYaw, 0, 1, 0);
+        GL11.glRotatef(motionPitch, 1, 0, 0);
+
         // Apply Y-axis rotation for spin
         GL11.glRotatef(disc.getInterpolatedRotationY(partialTicks), 0.0f, 1.0f, 0.0f);
 

src/main/java/kamkeel/npcs/client/renderer/RenderAbilityOrb.java

@@ -4,6 +4,8 @@ import cpw.mods.fml.relauncher.Side;
 import cpw.mods.fml.relauncher.SideOnly;
 import kamkeel.npcs.entity.EntityAbilityOrb;
 import net.minecraft.entity.Entity;
+import net.minecraft.util.Vec3;
+import noppes.npcs.util.MathUtil;
 import org.lwjgl.opengl.GL11;
 
 /**
@@ -37,6 +39,16 @@ public class RenderAbilityOrb extends RenderEnergyAbility {
             renderAttachedLightning(orb, 0.6f * 0.5f, scale);
         }
 
+        double motionX = entity.motionX;
+        double motionY = entity.motionY;
+        double motionZ = entity.motionZ;
+        Vec3 motionVec = Vec3.createVectorHelper(motionX, motionY, motionZ);
+
+        float motionYaw = MathUtil.getYaw(motionVec);
+        float motionPitch = MathUtil.getPitch(motionVec);
+        GL11.glRotatef(motionYaw, 0, 1, 0);
+        GL11.glRotatef(motionPitch, 1, 0, 0);
+
         // Use entity's interpolated rotation for smooth spinning
         GL11.glRotatef(orb.getInterpolatedRotationX(partialTicks), 1.0f, 0.0f, 0.0f);
         GL11.glRotatef(orb.getInterpolatedRotationY(partialTicks), 0.0f, 1.0f, 0.0f);

src/main/java/noppes/npcs/util/MathUtil.java

@@ -0,0 +1,24 @@
+package noppes.npcs.util;
+
+import net.minecraft.util.Vec3;
+
+public class MathUtil {
+
+    public static float getYaw(Vec3 vector) {
+        double x = vector.xCoord;
+        double z = vector.zCoord;
+        double yawRad   = Math.atan2(z, x);
+
+        return 90F - (float) Math.toDegrees(yawRad);
+    }
+
+    public static float getPitch(Vec3 vector) {
+        double x = vector.xCoord;
+        double y = vector.yCoord;
+        double z = vector.zCoord;
+        double horizontalMag = Math.sqrt(x * x + z * z);
+        double pitchRad = Math.atan2(y, horizontalMag);
+
+        return (float) -Math.toDegrees(pitchRad);
+    }
+}