[1.12.1] [SOLVED] Help to Draw line

JdiJack · September 15, 2017

Hi, I'm a new form of forge, I'm having trouble drawing a vertical line in the world, in the ItemSpada1.java class I have 2 methods to draw a line from the click block. The line is never drawn, what am I doing wrong?

Source code:

https://github.com/JdiJack/TutorialMod/blob/master/src/main/java/it/petitogennaro/tutorial_mod/items/ItemSpada1.java

the final effect must be similar to this:

[SOLUTION]

at the bottom of the topic

Edited September 28, 2017 by JdiJack

Busti · September 15, 2017

You can't just go ahead and try to draw stuff in a method like that.

You have to do that when the game is being rendered.

Games like Minecraft commonly have a separate render and game loop.

One is for executing game logic the other one is for drawing graphics.

I could now go ahead and list all the different ways there are in minecraftforge to render specific kinds of graphical elements from Blocks over Entities to GUIs and using specific events.
But it would be better to know what you are trying to accomplish in the long run.

JdiJack · September 15, 2017

1 hour ago, Busti said:

You can't just go ahead and try to draw stuff in a method like that.

You have to do that when the game is being rendered.

Games like Minecraft commonly have a separate render and game loop.

One is for executing game logic the other one is for drawing graphics.

I could now go ahead and list all the different ways there are in minecraftforge to render specific kinds of graphical elements from Blocks over Entities to GUIs and using specific events.
But it would be better to know what you are trying to accomplish in the long run.

I thank you for the clarification. I want to draw more contour lines of a block going to the sky. Now, however, I have no idea where to place my drawlines ();

JdiJack · September 15, 2017

Thanks to your advice I changed the structure of my project now in the "ItemSpada1.java" class, I only care to store the coordinates. I thought I would use "RenderGameOverlayEvent.Post" but I still do not see any line. What am I doing wrong?

Source code:

https://github.com/JdiJack/TutorialMod/blob/master/src/main/java/it/petitogennaro/tutorial_mod/MyEventHandler.java

Busti · September 15, 2017

You can't just draw things to coordinates and expect them to work.
As the name implies RenderGameOverlayEvent is for drawing overlays, e.g. a minimap and whatnot.

When drawing the player becomes the origin of the rendering coordinate system.

You probably want to have a look at TileEntitySpecialRenderers to get a better concept of how minecrafts rendering works.

Is the effect you want to achieve similar to a beacon beam?

JdiJack · September 15, 2017

16 minutes ago, Busti said:

You can't just draw things to coordinates and expect them to work.
As the name implies RenderGameOverlayEvent is for drawing overlays, e.g. a minimap and whatnot.

When drawing the player becomes the origin of the rendering coordinate system.

You probably want to have a look at TileEntitySpecialRenderers to get a better concept of how minecrafts rendering works.

Is the effect you want to achieve similar to a beacon beam?

the final effect must be similar to this:

Edited September 15, 2017 by JdiJack

Busti · September 15, 2017

You probably want to hook into EntityViewRenderEvent.

JdiJack · September 15, 2017

44 minutes ago, Busti said:

You probably want to hook into EntityViewRenderEvent.

I'm desolate but I can not go ahead, please give me the working code, I'm trying to draw in the "RenderWorldLastEvent" event and the lines are never drawn. I have created a new "drawLine5 ()" method in the "DrawHandler" class and it does not work.

Busti · September 15, 2017

Have a look at how botania uses the event to render a ghost preview of a block:

https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/client/core/handler/AstrolabePreviewHandler.java

You'll also have to create a Proxy class to register your event:

https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/client/core/proxy/ClientProxy.java

Read more on events here:
https://mcforge.readthedocs.io/en/latest/events/intro/

Looking through other open source mods is generally a good way to get an understanding of how to approach certain things.

JdiJack · September 16, 2017

11 hours ago, Busti said:

Date un'occhiata a come botania utilizza l'evento per rendere un'anteprima fantasma di un blocco:

https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/client/core/handler/AstrolabePreviewHandler.java

Devi anche creare una classe Proxy per registrare l'evento:

https://github.com/Vazkii/Botania/blob/master/src/main/java/vazkii/botania/client/core/proxy/ClientProxy.java

Per saperne di più sugli eventi qui:
https://mcforge.readthedocs.io/en/latest/events/intro/

Guardare attraverso altri mod open source è generalmente un buon modo per comprendere come affrontare determinate cose.

busti thank you for the time you are devoting to my project, I accept your suggestions, as indicated by you I went to study the mod botania, but can you tell me why my code does not work? I want to draw a simple line and I can not, what's wrong? I am going crazy

JdiJack · September 16, 2017

I followed this example perfectly well, the line is not drawn.

My project: https://github.com/JdiJack/TutorialMod/tree/master/src/main/java/it/petitogennaro/tutorial_mod

JdiJack · September 16, 2017

up

Busti · September 16, 2017

My best guess would be that either your event handler is not called, in order to test that you should try to print something to your console in your eventhandler,

or that your line is being drawn somewhere else.

When I first rendered a custom block it was drawn at the coordinates 0, 0, 0 in the world.

JdiJack · September 28, 2017

On 17/9/2017 at 1:31 AM, Busti said:

Finally a few days ago, I managed to draw my first line, my thanks go to "Butsi" who had the patience to put me on the right path.

Updated topic start, code Solution:

public static void drawBoundingBox(Vec3d player_pos, Vec3d posA, Vec3d posB, boolean smooth, float width) {

		GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
		GL11.glDisable(GL11.GL_CULL_FACE);
		GL11.glDisable(GL11.GL_LIGHTING);
		GL11.glDisable(GL11.GL_TEXTURE_2D);

		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		GL11.glTranslated(-player_pos.x, -player_pos.y, -player_pos.z);

		Color c = new Color(255, 0, 0, 150);
		GL11.glColor4d(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha());
		GL11.glLineWidth(width);
		GL11.glDepthMask(false);
		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferBuilder = tessellator.getBuffer();
		bufferBuilder.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);

		double dx = Math.abs(posA.x - posB.x);
		double dy = Math.abs(posA.y - posB.y);
		double dz = Math.abs(posA.z - posB.z);

		//AB
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		//BC
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		//CD
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		//DA
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		//EF
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		//FG
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		//GH
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H
		//HE
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		//AE
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		//BF
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		//CG
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		//DH
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H

		tessellator.draw();      


		GL11.glDepthMask(true);
		GL11.glPopAttrib();
	}

SpeedDart · December 26, 2019

On 9/28/2017 at 5:51 AM, JdiJack said:

Finally a few days ago, I managed to draw my first line, my thanks go to "Butsi" who had the patience to put me on the right path.

Updated topic start, code Solution:


public static void drawBoundingBox(Vec3d player_pos, Vec3d posA, Vec3d posB, boolean smooth, float width) {

		GL11.glPushAttrib(GL11.GL_ENABLE_BIT);
		GL11.glDisable(GL11.GL_CULL_FACE);
		GL11.glDisable(GL11.GL_LIGHTING);
		GL11.glDisable(GL11.GL_TEXTURE_2D);

		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		GL11.glTranslated(-player_pos.x, -player_pos.y, -player_pos.z);

		Color c = new Color(255, 0, 0, 150);
		GL11.glColor4d(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha());
		GL11.glLineWidth(width);
		GL11.glDepthMask(false);
		Tessellator tessellator = Tessellator.getInstance();
		BufferBuilder bufferBuilder = tessellator.getBuffer();
		bufferBuilder.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);

		double dx = Math.abs(posA.x - posB.x);
		double dy = Math.abs(posA.y - posB.y);
		double dz = Math.abs(posA.z - posB.z);

		//AB
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		//BC
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		//CD
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		//DA
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		//EF
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		//FG
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		//GH
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H
		//HE
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		//AE
		bufferBuilder.pos(posA.x, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();          //A
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //E
		//BF
		bufferBuilder.pos(posA.x, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //B
		bufferBuilder.pos(posA.x, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //F
		//CG
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //C
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z+dz).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex(); //G
		//DH
		bufferBuilder.pos(posA.x+dx, posA.y, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();       //D
		bufferBuilder.pos(posA.x+dx, posA.y+dy, posA.z).color(c.getRed(), c.getGreen(), c.getBlue(), c.getAlpha()).endVertex();    //H

		tessellator.draw();      


		GL11.glDepthMask(true);
		GL11.glPopAttrib();
	}

Hello, I noticed you solved this problem and I have a similar problem to solve. Where did you call this method? I also want to construct a box I am unable to do this on the server side, making my game crash.

diesieben07 · December 26, 2019

27 minutes ago, SpeedDart said:

Hello, I noticed you solved this problem and I have a similar problem to solve. Where did you call this method? I also want to construct a box I am unable to do this on the server side, making my game crash.

Yes, rending is completely client-side.

Make your own thread.

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[1.12.1] [SOLVED] Help to Draw line

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