BlazingTwist

Case closed, I'm an idiot! I just took a real close look at the debug and it turns out x1=-981.5 | x2=-981.5 | y1=4.70253470330818 | y2=4.70253470330818 | z1=279.5 | z2=279.5 ALL variables are the same! I just missed it the first time I checked because the numbers were flying past so quickly. It seems that Entity::posY and Entity::lastTickPosY are the same value. Fixed by using Entity::prevPosY instead.

Okay... NOW I am confused... I changed a few things, I'm registering the listener in my client proxy now public class ClientProxy extends CommonProxy{ EntityTracker entityTracker; @Override public void postInit(FMLPostInitializationEvent event) { super.postInit(event); entityTracker = new EntityTracker(this); MinecraftForge.EVENT_BUS.register(entityTracker); } } And I changed my onWorldRender function to not be static (as that messed with my eventlistener before, so I though 1+1=2, and it probably is, I just suck at math and got 3 instead) I also minimized the use of GL11 and accessed GlStateManager instead. public class EntityTracker { ClientProxy proxy; public static HashMap<String, TrackingData> observedEntityID = new HashMap<String, TrackingData>(); public static ArrayList<TracingData> tracingHistory = new ArrayList<TracingData>(); public EntityTracker(ClientProxy proxy){ this.proxy = proxy; } @SubscribeEvent public void onWorldRender(RenderWorldLastEvent event) { if(tracingHistory == null || tracingHistory.size() <= 0) { return; } if(Minecraft.getMinecraft().player == null) { return; } Vec3d player_pos = Minecraft.getMinecraft().player.getPositionVector(); GlStateManager.pushMatrix(); GlStateManager.disableTexture2D(); GlStateManager.enableBlend(); GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); GlStateManager.translate(-player_pos.x, -player_pos.y, -player_pos.z); final Tessellator tessellator = Tessellator.getInstance(); final BufferBuilder bufferBuilder = tessellator.getBuffer(); bufferBuilder.begin(GL11.GL_LINE_STRIP, DefaultVertexFormats.POSITION_COLOR); TracingData trace_data; TrackingData track_data; for(Iterator<TracingData> it=tracingHistory.iterator(); it.hasNext();) { trace_data = it.next(); track_data=observedEntityID.get(trace_data.ID); trace_data.setupDrawingBuffer(bufferBuilder, track_data); if(System.currentTimeMillis()-trace_data.timeOfCreation>=(track_data.getTime()*1000) && ModuleManager.mode==0) { //rendered time >= max time it.remove(); } } tessellator.draw(); GlStateManager.glLineWidth(1.0f); GlStateManager.disableBlend(); GlStateManager.enableTexture2D(); GlStateManager.popMatrix(); } } Also TracingData::setupDrawingBuffer() is doing a little bit more stuff now: public void setupDrawingBuffer(BufferBuilder bufferBuilder ,TrackingData td) { GlStateManager.glLineWidth(td.getThickness()); //y1->y2 | x1->x2 | z1->z2 bufferBuilder.pos(x1, y1, z1).color(0,0,0,0).endVertex(); bufferBuilder.pos(x1, y2, z1).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos(x2, y2, z1).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos(x2, y2, z2).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); //render bounding box lines bufferBuilder.pos((x2-0.49), (y2-0.49), (z2-0.49)).color(0,0,0,0).endVertex(); bufferBuilder.pos((x2+0.49), (y2-0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2+0.49), (y2-0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2-0.49), (y2-0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2-0.49), (y2-0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2-0.49), (y2+0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2+0.49), (y2+0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2+0.49), (y2+0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2-0.49), (y2+0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2-0.49), (y2-0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); //fill missing 3 lines bufferBuilder.pos((x2-0.49), (y2+0.49), (z2+0.49)).color(0,0,0,0).endVertex(); bufferBuilder.pos((x2-0.49), (y2+0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2+0.49), (y2-0.49), (z2-0.49)).color(0,0,0,0).endVertex(); bufferBuilder.pos((x2+0.49), (y2+0.49), (z2-0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos((x2+0.49), (y2-0.49), (z2+0.49)).color(0,0,0,0).endVertex(); bufferBuilder.pos((x2+0.49), (y2+0.49), (z2+0.49)).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); } So, what's the problem now, you ask? For some reason it DOES render the complete lower half of TracingData::setupDrawingBuffer, I get a flawless boundingbox, but it does NOT render the first 3 lines (y1->y2 | x1->x2 | z1->z2)

You could start by taking a look at the source code of your reference. https://github.com/MatterOverdrive/MatterOverdrive-Legacy-Edition/blob/1.12.2/src/main/java/matteroverdrive/client/render/biostat/BioticStatRendererShield.java And while you're at it, maybe take a look at this. You'll probably find something helpful there aswell. https://relativity.net.au/gaming/java/openGL_basics.html

I'm a little lost to be honest, my code isn't throwing any errors and after doing some debugging in console the values of all variables seem fine, yet I end up with no lines in my world space whatsoever. I know that the actual rendering part of my code (should) work (because I used it in a hacked client before I wanted to recreate it as a forge mod), so I assume that I did something wrong when registering the listener or subscribing to the proper event. Here is the code for registering the listener in my Main: @EventHandler public static void postInit(FMLPostInitializationEvent event) { MinecraftForge.EVENT_BUS.register(new EntityListener()); } And here is the corresponding section in EntityListener @SubscribeEvent public void renderWorld(RenderWorldLastEvent event) { EntityTracker.onWorldRender(); } Lastly here is the onWorldRender function in EntityTracker (I know this is a conflicting classname, didn't bother changing it yet as it shouldn't cause any issues (?), not like I plan to ever publish this anyway) public static void onWorldRender() { if(tracingHistory != null && tracingHistory.size() > 0) { if(Minecraft.getMinecraft().player == null) { return; } Vec3d player_pos = Minecraft.getMinecraft().player.getPositionVector(); GlStateManager.pushMatrix(); GlStateManager.disableTexture2D(); GlStateManager.enableBlend(); GlStateManager.blendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA); GlStateManager.translate(-player_pos.x, -player_pos.y, -player_pos.z); final Tessellator tessellator = Tessellator.getInstance(); final BufferBuilder bufferBuilder = tessellator.getBuffer(); GL11.glEnable(GL11.GL_LINE_SMOOTH); bufferBuilder.begin(GL11.GL_LINE_STRIP, DefaultVertexFormats.POSITION_COLOR); TracingData trace_data; TrackingData track_data; for(Iterator<TracingData> it=tracingHistory.iterator(); it.hasNext();) { trace_data = it.next(); track_data=observedEntityID.get(trace_data.ID); trace_data.setupDrawingBuffer(bufferBuilder, track_data); if(System.currentTimeMillis() - trace_data.timeOfCreation >= (track_data.getTime()*1000) && ModuleManager.mode == 0) { //rendered time >= max time it.remove(); } } tessellator.draw(); GL11.glLineWidth(1.0f); GlStateManager.disableBlend(); GlStateManager.enableTexture2D(); GlStateManager.popMatrix(); } } I should probably show what TracingData::setupDrawingBuffer does aswell public void setupDrawingBuffer(BufferBuilder bufferBuilder ,TrackingData td) { GL11.glLineWidth(td.getThickness()); //y1->y2 | x1->x2 | z1->z2 bufferBuilder.pos(x1, y1, z1).color(0,0,0,0).endVertex(); bufferBuilder.pos(x1, y2, z1).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos(x2, y2, z1).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); bufferBuilder.pos(x2, y2, z2).color(td.getRed(), td.getGreen(), td.getBlue(), td.getAlpha()).endVertex(); } Sooo... any ideas? Would really appreciate help here.