[1.12.2] Rendering a line

xxTFxx · August 18, 2019

I need to render a line kind of like the Immersive Engineering cables.

I tried to use Minecraft's RenderFish class as example, but I had no luck doing it.

Spoiler


public class MesHandler implements IMessageHandler<Mes, IMessage>{

	@Override
	public IMessage onMessage(Mes message, MessageContext ctx) {
		
		if (ctx.side != Side.CLIENT) 
		{
		      System.err.println("Message received on wrong side:" + ctx.side);
		      return null;
		}
		
		
		int x = message.x;
		int y = message.y;
		int z = message.z;
		
		Vec3d vec1 = new Vec3d(x, y, z);
		Vec3d vec2 = new Vec3d(x + 2, y , z );
		
		//IThreadListener mainThread = Minecraft.getMinecraft();
		Minecraft mainThread = Minecraft.getMinecraft();
		mainThread.addScheduledTask(new Runnable() {
			
			@Override
			public void run() {
				draw(vec1, vec2);
				System.out.println(x + "  " + y + "  " + z);
			}
		});    	
		
		return null;
	}
	
	public static void draw(Vec3d posA, Vec3d posB) 
	{
		GlStateManager.pushMatrix();
		GlStateManager.disableTexture2D();
		GlStateManager.disableLighting();
		GlStateManager.glLineWidth(2.0F);

	    Tessellator tessellator = Tessellator.getInstance();
	    BufferBuilder buffer = tessellator.getBuffer();
	    buffer.begin(GL11.GL_LINE_STRIP, DefaultVertexFormats.POSITION_COLOR);
	    buffer.pos(posA.x, posA.y, posA.z).color(Color.BLACK.getRed(), Color.BLACK.getGreen(), Color.BLACK.getBlue(), Color.BLACK.getAlpha()).endVertex();
	    buffer.pos(posB.x, posB.y, posB.z).color(Color.BLACK.getRed(), Color.BLACK.getGreen(), Color.BLACK.getBlue(), Color.BLACK.getAlpha()).endVertex();
	    
	    tessellator.draw();

		GlStateManager.enableLighting();
		GlStateManager.enableTexture2D();
    }

Spoiler


public class Mes implements IMessage{

	public int x , y , z;
	
	public Mes(){}

    public Mes(int x , int y , int z){
        this.x = x;
        this.y = y;
        this.z = z;
    }

	@Override
	public void fromBytes(ByteBuf buf) {
		x = buf.readInt();
		y = buf.readInt();
		z = buf.readInt();
	}

	@Override
	public void toBytes(ByteBuf buf) {
		buf.writeInt(x);
		buf.writeInt(y);
		buf.writeInt(z);
	}
}

Spoiler


@Override
	public EnumActionResult onItemUse(EntityPlayer player, World worldIn, BlockPos pos, EnumHand hand,
			EnumFacing facing, float hitX, float hitY, float hitZ) {
  
  PacketHandler.INSTANCE.sendToAll(new Mes(player.getPosition().getX() , player.getPosition().getY() , player.getPosition().getZ()));
  
}

CAS_ual_TY · August 18, 2019

popMatrix() is missing,

does rendering using addScheduledTask really work? Shouldnt you use one of the world render events for that? RenderWorldLastEvent together with a place to store the cables client side is what I would do.

xxTFxx · August 18, 2019

So I managed to render a line using RenderWorldLastEvent, but I have no idea how to store the TileEntities on client side.

Spoiler


@SubscribeEvent
	public static void renderWorldLastEvent(RenderWorldLastEvent event)
	{
		
		GlStateManager.pushMatrix();
		//GlStateManager.pushAttrib();
		
		double x = 70;
		double y = 80;
		double z = 4;
		
		EntityPlayer rootPlayer = Minecraft.getMinecraft().player;
		
		double px = rootPlayer.lastTickPosX + (rootPlayer.posX - rootPlayer.lastTickPosX) * event.getPartialTicks();
		double py = rootPlayer.lastTickPosY + (rootPlayer.posY - rootPlayer.lastTickPosY) * event.getPartialTicks();
		double pz = rootPlayer.lastTickPosZ + (rootPlayer.posZ - rootPlayer.lastTickPosZ) * event.getPartialTicks();
		
		GlStateManager.translate(-px, -py, -pz);
		
		Vec3d vec1 = new Vec3d(x, y, z);
		Vec3d vec2 = new Vec3d(x + 2, y + 2, z + 2);

		LineRender.drawLine(vec1, vec2);			
		
		GlStateManager.popMatrix();
		//GlStateManager.popAttrib();
		
		
	}

DavidM · August 19, 2019

3 hours ago, xxTFxx said:

So I managed to render a line using RenderWorldLastEvent, but I have no idea how to store the TileEntities on client side.

Reveal hidden contents



@SubscribeEvent
	public static void renderWorldLastEvent(RenderWorldLastEvent event)
	{
		
		GlStateManager.pushMatrix();
		//GlStateManager.pushAttrib();
		
		double x = 70;
		double y = 80;
		double z = 4;
		
		EntityPlayer rootPlayer = Minecraft.getMinecraft().player;
		
		double px = rootPlayer.lastTickPosX + (rootPlayer.posX - rootPlayer.lastTickPosX) * event.getPartialTicks();
		double py = rootPlayer.lastTickPosY + (rootPlayer.posY - rootPlayer.lastTickPosY) * event.getPartialTicks();
		double pz = rootPlayer.lastTickPosZ + (rootPlayer.posZ - rootPlayer.lastTickPosZ) * event.getPartialTicks();
		
		GlStateManager.translate(-px, -py, -pz);
		
		Vec3d vec1 = new Vec3d(x, y, z);
		Vec3d vec2 = new Vec3d(x + 2, y + 2, z + 2);

		LineRender.drawLine(vec1, vec2);			
		
		GlStateManager.popMatrix();
		//GlStateManager.popAttrib();
		
		
	}

Use packets to sync tile entity’s data from server to client.

15 hours ago, CAS_ual_TY said:

RenderWorldLastEvent together with a place to store the cables client side is what I would do.

I would suggest making a TileEntityRenderer and do the rendering of cables there. Each tile entity would only renders its cables, therefore making another storage of cables unnecessary.

xxTFxx · August 19, 2019

Can I do something, so the TileEntity renders the cable when I don't look at the TileEntity?

Or do I need to render the cables twice from each end.

Draco18s · August 19, 2019

18 minutes ago, xxTFxx said:

Can I do something, so the TileEntity renders the cable when I don't look at the TileEntity?

Or do I need to render the cables twice from each end.

Oof. You might be better off just querying the nearby area for all instances of your TE (there's a chunk TE cache, don't examine every block) and render all* the cables all the time.

*I would only look at the 9 or 16 chunks directly around the player, if you have cables longer or farther away than that, fuck'em. (1) don't let cables be that long and (2) if they're that far away you don't need to be able to see them. Additionally you can cull any cables that aren't within 32 vertical blocks of the player as well (you'll need to write a check for this). Culling for things behind the camera will be too difficult and not worth it.

Edited August 19, 2019 by Draco18s

xxTFxx · August 19, 2019

23 minutes ago, Draco18s said:

*I would only look at the 9 or 16 chunks directly around the player, if you have cables longer or farther away than that, fuck'em.

That makes sense, but the problem is that TESR doesn't render the cable if I'm not looking at the TileEntity.

Spoiler


public class ConnectorRender extends TileEntitySpecialRenderer<TE_Connector>{

	@Override
	public void render(TE_Connector te, double x, double y, double z, float partialTicks, int destroyStage,
			float alpha) {

		if(te.isConnected())
		{
			BlockPos linkTo = te.getLinkTo();
			int dx = (te.getPos().getX() - linkTo.getX());
			int dy = (te.getPos().getY() - linkTo.getY());
			int dz = (te.getPos().getZ() - linkTo.getZ());
			
			GlStateManager.pushMatrix();
			GlStateManager.disableTexture2D();
			GlStateManager.glLineWidth(2.0F);
	
		    Tessellator tessellator = Tessellator.getInstance();
		    BufferBuilder buffer = tessellator.getBuffer();
		    buffer.begin(GL11.GL_LINE_STRIP, DefaultVertexFormats.POSITION_COLOR);
		    
		    
		    buffer.pos(x + 0.5D , y + 0.5D , z + 0.5D).color(Color.BLACK.getRed(), Color.BLACK.getGreen(), Color.BLACK.getBlue(), Color.BLACK.getAlpha()).endVertex();
		    buffer.pos(x - dx + 0.5D  , y - dy + 0.5D , z - dz + 0.5D).color(Color.BLACK.getRed(), Color.BLACK.getGreen(), Color.BLACK.getBlue(), Color.BLACK.getAlpha()).endVertex();
		    tessellator.draw();
	
			GlStateManager.enableTexture2D();
			GlStateManager.popMatrix();
		}
		
		
		
		super.render(te, x, y, z, partialTicks, destroyStage, alpha);
	}
	
	
}

Edited August 19, 2019 by xxTFxx

Draco18s · August 19, 2019

Well, of course, because TEs are culled when they are outside the view frustum. I was assuming that this was true:

14 hours ago, DavidM said:

So I managed to render a line using RenderWorldLastEvent

You don't need to *store* the cables anywhere. Inside the event you get the world from the Minecraft instance, query the TE cache that already exists, find your TEs, get their cables, render them.

DavidM · August 19, 2019

8 hours ago, xxTFxx said:

Can I do something, so the TileEntity renders the cable when I don't look at the TileEntity?

Or do I need to render the cables twice from each end.

Override TileEntity#getRenderBoundingBox and return NULL_AABB to make the tile entity render at all times (when you are not looking at it).

xxTFxx · August 21, 2019

On 8/20/2019 at 1:34 AM, DavidM said:

Override TileEntity#getRenderBoundingBox and return NULL_AABB to make the tile entity render at all times (when you are not looking at it).

When I do that it gives NullPointerException.

DavidM · August 21, 2019

That should be impossible. Show your code.

Note that NULL_AABB might had been renamed to INFINITE_EXTENT_AABB.

Edited August 21, 2019 by DavidM

xxTFxx · August 21, 2019

INFINITE_EXTENT_AABB seems to work, but only when I'm within the same chunk as the TE.

Edited August 21, 2019 by xxTFxx

xxTFxx · August 22, 2019

Is there something I can do to make this work?

It renders properly even if I'm not looking at the TE, but only when I'm in the same chunk as TE.

My code:

Spoiler


public class ConnectorRender extends TileEntitySpecialRenderer<TE_Connector>{

	@Override
	public void render(TE_Connector te, double x, double y, double z, float partialTicks, int destroyStage,
			float alpha) {

		if(te.hasConnectionTo())
		{
			BlockPos linkTo = te.getLinkTo();
			
			Vec3d vec1 = new Vec3d(x + 0.5D, y + 0.5D,  z + 0.5D);
			Vec3d vec2 = new Vec3d(linkTo.getX() + 0.5D , linkTo.getY() + 0.5D, linkTo.getZ() + 0.5D);
			
			GlStateManager.pushMatrix();

			GlStateManager.disableTexture2D();
			GlStateManager.glLineWidth(2.0F);

		    Tessellator tessellator = Tessellator.getInstance();
		    BufferBuilder buffer = tessellator.getBuffer();
		    buffer.begin(GL11.GL_LINE_STRIP, DefaultVertexFormats.POSITION_COLOR);
		    double lenght = Math.sqrt( (te.getPos().getX() + 0.5D - vec2.x) * (te.getPos().getX() + 0.5D - vec2.x) + (te.getPos().getY() + 0.5D - vec2.y) * (te.getPos().getY() + 0.5D - vec2.y)  + (te.getPos().getZ() + 0.5D - vec2.z) * (te.getPos().getZ() + 0.5D - vec2.z) );
		    
		    double a = 1 / (25 * Math.sqrt(lenght));
		    
		    for(double i = 0 ; i <= lenght + 0.1D ; i += 0.2D)
		    {
		    	double y1 = a * (i) * (i - lenght);
		    	Vec3d vec3;
		    	if( te.getPos().getX() + 0.5D - vec2.x > 0 || te.getPos().getX() + 0.5D - vec2.x == 0 )
		    	{
		    		vec3 = new Vec3d(vec1.x - i, vec1.y + y1, vec1.z);
		    	}
		    	else
		    	{
		    		vec3 = new Vec3d(vec1.x + i, vec1.y + y1, vec1.z);
		    	}
		    	buffer.pos(vec3.x , vec3.y , vec3.z).color(Color.BLACK.getRed(), Color.BLACK.getGreen(), Color.BLACK.getBlue(), Color.BLACK.getAlpha()).endVertex();
		    }
		    if(te.getPos().getZ() != linkTo.getZ())
		    {
		    	double l_x = Math.sqrt( (te.getPos().getX() + 0.5D - vec2.x) * (te.getPos().getX() + 0.5D - vec2.x) );
		    	double l_z = Math.sqrt( (te.getPos().getZ() + 0.5D - vec2.z) * (te.getPos().getZ() + 0.5D - vec2.z) );
		    	double atan = Math.atan( l_z / l_x );
		    	double angle = Math.toDegrees(atan);
		    	if(te.getPos().getZ() + 0.5D - vec2.z > 0) angle = -angle;
		    	if(te.getPos().getX() + 0.5D - vec2.x < 0) angle = -angle;
		    	if(angle != 0)
		    	{
		    		GlStateManager.translate(x  + 0.5D, 0, z  + 0.5D);
				    GlStateManager.rotate((float) angle, 0, 1, 0);
				    GlStateManager.translate(-x - 0.5D , 0, -z - 0.5D  );
		    	}
		    }
		    
		    if(te.getPos().getY() != linkTo.getY())
		    {
		    	double l_x = te.getPos().getX() + 0.5D - vec2.x;
		    	double l_z = te.getPos().getZ() + 0.5D - vec2.z;
		    	double l_y = Math.sqrt( l_x * l_x + l_z * l_z);
		    	double atan = Math.atan( (te.getPos().getY() + 0.5D - vec2.y) / l_y );
		    	double angle = Math.toDegrees(atan);

		    	if(Math.abs(te.getPos().getX()) + 0.5D - Math.abs(vec2.x) < 0)
		    	{
		    		angle = -angle;
		    	}
		    	if(angle != 0)
		    	{
		    		GlStateManager.translate(x + 0.5D, y + 0.5D, z + 0.5D);
				    GlStateManager.rotate((float) angle, 0, 0, 1);
				    GlStateManager.translate(-x - 0.5D , -y - 0.5D , -z - 0.5D);
		    	}
		    }
		    
		    
		    tessellator.draw();
			GlStateManager.enableTexture2D();
			
			GlStateManager.popMatrix();
		}
			
		super.render(te, x, y, z, partialTicks, destroyStage, alpha);
	}
	
}

Spoiler


public class TE_Connector extends TileEntity implements ITickable{
	
	private boolean connectionTo = false;
	private boolean connectionFrom = false;
	private BlockPos linkTo;
	private BlockPos linkFrom;
	private int timer = 0;
	private CustomEnergyStorage storage = new CustomEnergyStorage(100, 100);
	private int output = 100;
	
	@Override
	public void update() {
		
		if(storage.getEnergyStored() >= output)
		{
			if(connectionTo)
			{
				TileEntity tile = world.getTileEntity(linkTo);
				if(tile instanceof TE_Connector)
				{
					if(tile.hasCapability(CapabilityEnergy.ENERGY, null))
					{
						IEnergyStorage handler = tile.getCapability(CapabilityEnergy.ENERGY, null);
						if(handler != null && handler.getEnergyStored() + output <= handler.getMaxEnergyStored())
						{
							handler.receiveEnergy(output, false);
							storage.consumeEnergy(output);
						}
					}
				}
			}		
		}
		
		sendEnergy();
		
	}
	
	public boolean hasConnectionTo()
	{		
		return this.connectionTo;
	}
	
	public boolean hasConnectionFrom()
	{
		return this.connectionFrom;
	}
	
	public void changeConnectionToState(boolean state)
	{
		this.connectionTo = state;
	}
	
	public void changeConnectionFromState(boolean state)
	{
		this.connectionFrom = state;
	}
	
	public void setLinkTo(int x , int y , int z)
	{
		this.linkTo = new BlockPos(x, y, z);
	}
	
	public void setLinkFrom(int x , int y , int z)
	{
		this.linkFrom = new BlockPos(x, y, z);
	}
	
	public BlockPos getLinkTo()
	{
		return this.linkTo;
	}
	
	public BlockPos getLinkFrom()
	{
		return this.linkFrom;
	}
	
	private void sendEnergy() {
		if(storage.getEnergyStored() >= output )
		{
			for(EnumFacing facing : EnumFacing.VALUES)
			{
				TileEntity tile = world.getTileEntity(pos.offset(facing));
				if(tile != null && !(tile instanceof TE_Connector) && tile.hasCapability(CapabilityEnergy.ENERGY, facing.getOpposite()))
				{
					IEnergyStorage handler = tile.getCapability(CapabilityEnergy.ENERGY, facing.getOpposite());
					if(handler != null && handler.canReceive() && handler.getEnergyStored() + output <= handler.getMaxEnergyStored())
					{
						handler.receiveEnergy(output, false);
						storage.consumeEnergy(output);
					}
					else return;
				}
			}
			markDirty();
		}
	}
	
	@Override
	public AxisAlignedBB getRenderBoundingBox() {
		//return new AxisAlignedBB(this.pos.getX() - 32, this.pos.getY() -32, this.pos.getZ() - 32, this.pos.getX() + 32, this.pos.getY() + 32, this.pos.getZ() + 32);
		return INFINITE_EXTENT_AABB;
	}
	
	public IBlockState getState() {
		return world.getBlockState(pos);
	}
	
	@Override
	public boolean hasCapability(Capability<?> capability, EnumFacing facing) {
		
		if(capability.equals(CapabilityEnergy.ENERGY))
		{
			return true;
		}
		return super.hasCapability(capability, facing);
	}
	
	@Override
	public <T> T getCapability(Capability<T> capability, EnumFacing facing) {
		if(capability.equals(CapabilityEnergy.ENERGY))
		{
			return (T)this.storage;
		}
		return super.getCapability(capability, facing);
	}
	
	@Override
	public NBTTagCompound writeToNBT(NBTTagCompound compound) {
		super.writeToNBT(compound);
		this.storage.writeToNBT(compound);
		compound.setBoolean("hasConnection", this.connectionTo);
		compound.setBoolean("hasConnectionFrom", this.connectionFrom);
		if(this.connectionTo)
		{
			compound.setInteger("xTo", this.linkTo.getX());
			compound.setInteger("yTo", this.linkTo.getY());
			compound.setInteger("zTo", this.linkTo.getZ());			
		}
		if(this.connectionFrom)
		{
			compound.setInteger("xFrom", this.linkFrom.getX());
			compound.setInteger("yFrom", this.linkFrom.getY());
			compound.setInteger("zFrom", this.linkFrom.getZ());			
		}
		return compound;
	}
	
	@Override
	public void readFromNBT(NBTTagCompound compound) {
		super.readFromNBT(compound);
		this.storage.readFromNBT(compound);
		this.connectionTo = compound.getBoolean("hasConnection");
		this.connectionFrom = compound.getBoolean("hasConnectionFrom");
		if(this.connectionTo)
		{
			this.setLinkTo(compound.getInteger("xTo"), compound.getInteger("yTo"), compound.getInteger("zTo"));			
		}
		if(this.connectionFrom)
		{
			this.setLinkFrom(compound.getInteger("xFrom"), compound.getInteger("yFrom"), compound.getInteger("zFrom"));	
		}
	}
}

I know it's not well optimised, but for now I'm just trying to make this work.

Animefan8888 · August 22, 2019

17 minutes ago, xxTFxx said:

but only when I'm in the same chunk as TE.

You also need to override TileEntity#getMaxRenderDIstanceSquared for reference the Beacon returns a value of 65536.0D

xxTFxx · August 22, 2019

32 minutes ago, Animefan8888 said:

You also need to override TileEntity#getMaxRenderDIstanceSquared for reference the Beacon returns a value of 65536.0D

Ok, I've tested it and it also works only when I'm looking at the TE.

Animefan8888 · August 22, 2019

4 minutes ago, xxTFxx said:

Ok, I've tested it and it also works only when I'm looking at the TE.

Did you change the bounding box away from INFINITE_EXTENT_AABB? Because otherwise it should assume you are always looking at it.

FredTargaryen · August 22, 2019

This might not help (sorry) but I have a TESR which draws long tracks which used to disappear when looked at from a certain angle, with the block off the screen. That was only fixed by overriding isGlobalRenderer, returning true. This might hurt performance if you plan to have a lot of these blocks but I didn't have any problems with about 50 of those blocks on the screen (didn't try any higher).

xxTFxx · August 22, 2019

5 minutes ago, FredTargaryen said:

This might not help (sorry) but I have a TESR which draws long tracks which used to disappear when looked at from a certain angle, with the block off the screen. That was only fixed by overriding isGlobalRenderer, returning true. This might hurt performance if you plan to have a lot of these blocks but I didn't have any problems with about 50 of those blocks on the screen (didn't try any higher).

Thanks, that did actually helped.

Animefan8888 · August 22, 2019

40 minutes ago, xxTFxx said:

Ok, I've tested it and it also works only when I'm looking at the TE.

This is also what the TileEntityBeaconRenderer does ???

6 minutes ago, FredTargaryen said:

This might not help (sorry) but I have a TESR which draws long tracks which used to disappear when looked at from a certain angle, with the block off the screen. That was only fixed by overriding isGlobalRenderer, returning true. This might hurt performance if you plan to have a lot of these blocks but I didn't have any problems with about 50 of those blocks on the screen (didn't try any higher).

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[1.12.2] Rendering a line

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