[Solved] [1.16.5] Render line between two blocks

[Block]

Please help me, I have been trying to do this for a long time, but I can't do it. How can draw a line between two coordinates in the world, for example between two blocks?

I try, but it doesn't work: (calling drawLine in Event RenderWorldLastEvent: drawLine(0,0,0,10,10,10);)

private static void drawLine(double x1, double y1, double z1, double x2, double y2, double z2) 
{
        Tessellator tessellator = Tessellator.getInstance();
        BufferBuilder bufferbuilder = tessellator.getBuilder();
        bufferbuilder.begin(3, DefaultVertexFormats.POSITION_COLOR);
        bufferbuilder.vertex(x1, y1, z1).color(255,0,0, 255).endVertex();
        bufferbuilder.vertex(x2, y2, z2).color(255,0,0, 255).endVertex();
        tessellator.end();
}

 

Edited May 10, 2021 by Block

[Block]

Hi, help me please. I've been trying to do this for a long time, I've reviewed a bunch of sources, but it doesn't work. I want to draw a line between two coordinates (for example 0, 0, 0 and 10, 10, 10)
I understand that the line is drawn relative to 0 coordinates, and they need to be changed relative to the player (otherwise the line will move with the player)
1. But here's the trouble, the line is not displayed for me, what could be the problem?
2. By the way, the pushMatrix and translated methods of the GlStateManager class are deprecated. What is the actual replacement for this?

My code:

Spoiler

private static void drawLine(float x1, float y1, float z1, float x2, float y2, float z2, float partialTicks) 
{
    Entity entity = Minecraft.getInstance().getRenderViewEntity();
  
    double x_fix = entity.lastTickPosX + (entity.getPosX() - entity.lastTickPosX) * partialTicks;
    double y_fix = entity.lastTickPosY + (entity.getPosY() - entity.lastTickPosY) * partialTicks;
    double z_fix = entity.lastTickPosZ + (entity.getPosZ() - entity.lastTickPosZ) * partialTicks;
    GlStateManager.pushMatrix();
    GlStateManager.translated(-x_fix, -y_fix, -z_fix);

    Tessellator tessellator = Tessellator.getInstance();
    BufferBuilder bufferbuilder = tessellator.getBuffer();

    GlStateManager.lineWidth(5);

    bufferbuilder.begin(GL11.GL_LINE, DefaultVertexFormats.POSITION_COLOR);
    bufferbuilder.pos(x1, y1 , z1).color(255,0,0, 255).endVertex();
    bufferbuilder.pos(x2, y2 , z2).color(255,0,0, 255).endVertex();
    tessellator.draw();

    GlStateManager.lineWidth(1);
    GlStateManager.popMatrix();
}

 

Spoiler

@SubscribeEvent
public static void renderWorld(RenderWorldLastEvent event)
{
  drawLine(0,0,0,50,50,50, event.getPartialTicks());
}

 

P.S. Method drawLine() works because if I display a message to the player, then everything is displayed, but the line is not.

Edited May 10, 2021 by Block
issue resolved

[Draco18s]

IIRC the LINE drawing mode of OpenGL doesn't actually draw anything. (I think that's what the 3 specifies in your begin() call).

It's been a long time since I messed with this, but the drawing mode I used was QUADS (you should use the constants around...somewhere, but numerically it's probably 7) and give your line some amount of thickness.

 

This is some really old code, but has the relevant math.

https://github.com/Draco18s/HarderStuff/blob/master/src/main/java/com/draco18s/hazards/client/HazardsClientEventHandler.java#L422-L451

[Block]

UPDATE:

Hooray!!!! 

I did as I wanted, but there is a problem:

When I turn on 3-person view, my line starts to move by an angle of rotation head, down or up or left or right.

So how do I get the angle of rotation of the camera from the 3rd person?

entity.getPitchYaw () doesn't work because this is the angle of the turn of the head.

 

I get the coordinate shift like so:

Spoiler

Entity entity = Minecraft.getInstance().getRenderViewEntity();

double x_fix = entity.lastTickPosX + (entity.getPosX() - entity.lastTickPosX) * event.getPartialTicks();
double y_fix = entity.lastTickPosY + (entity.getPosY() - entity.lastTickPosY) * event.getPartialTicks();
double z_fix = entity.lastTickPosZ + (entity.getPosZ() - entity.lastTickPosZ) * event.getPartialTicks();

matrixStack.push();
matrixStack.translate(-x_fix, -y_fix, -z_fix);

 

 

[Block]

UPDATE №2:

Two days of searching later, Hooray!!!!

I managed to implement a method that draws a line from block 1 to block 2.

If anyone needs, here is my method:

Spoiler

public static void renderLine(RenderWorldLastEvent event, Vec3d vecStart, Vec3d vecEnd, Color4f color, int lineWidth)
{
    Tessellator tessellator = Tessellator.getInstance();
    BufferBuilder bufferbuilder = tessellator.getBuffer();
    MatrixStack matrixStack = event.getMatrixStack();
    Vector3d projectedView = Minecraft.getInstance().gameRenderer.getActiveRenderInfo().getProjectedView();

    matrixStack.push();
    matrixStack.translate(-projectedView.x, -projectedView.y, -projectedView.z);
    RenderSystem.lineWidth(lineWidth);

    Matrix4f matrix = matrixStack.getLast().getMatrix();

    bufferbuilder.begin(GL11.GL_LINES, DefaultVertexFormats.POSITION_COLOR);
    drawLine(matrix, bufferbuilder, vecStart, vecEnd, color);
    tessellator.draw();

    GlStateManager.lineWidth(1);
    matrixStack.pop();
}

private static void drawLine(Matrix4f matrix, BufferBuilder buffer, Vec3d p1, Vec3d p2, Color4f color) 
{
    buffer.pos(matrix, (float)p1.x + 0.5f, (float)p1.y + 1.0f, (float)p1.z + 0.5f)
      .color(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha())
      .endVertex();
    buffer.pos(matrix, (float)p2.x + 0.5f, (float)p2.y, (float)p2.z + 0.5f)
      .color(color.getRed(), color.getGreen(), color.getBlue(), color.getAlpha())
      .endVertex();
}

 

Call example:

Spoiler

// Draws a line from 0, 0, 0 to 10, 10, 10 (x y z)
Color4f color = new Color4f(0, 1, 0, 1);
renderLine(event, new Vec3d(0, 0, 0), new Vec3d(10, 10, 10), color, 4);

 

 

[Block]

2 hours ago, Draco18s said:

IIRC the LINE drawing mode of OpenGL doesn't actually draw anything. (I think that's what the 3 specifies in your begin() call).

It's been a long time since I messed with this, but the drawing mode I used was QUADS (you should use the constants around...somewhere, but numerically it's probably 7) and give your line some amount of thickness.

 

This is some really old code, but has the relevant math.

https://github.com/Draco18s/HarderStuff/blob/master/src/main/java/com/draco18s/hazards/client/HazardsClientEventHandler.java#L422-L451

I decided to roll back the version just below, and I ended up drawing a line: Forum thread