I am having trouble with rending a box. There is a weird "quad" that is rendering at (0, 0, 0). It seems to only happen when I render more than 1 quad.

 

Here is the rendering code:

public static final void renderSelectionBox(
		Tessellator tessellator, VertexBuffer ren,
		float minX, float minY, float minZ,
		float maxX, float maxY, float maxZ, float a
		) {
	float U = Math.round(maxX - minX);
	float V = Math.round(maxY - minY);
	float W = Math.round(maxZ - minZ);
	float VOLUME = U*V*W;

	float SPEED = 10000;
	float UVW_DIVIDE = 1;

	if(VOLUME > (128*128*128)) {
		UVW_DIVIDE = 128f;
		SPEED = 10000;
	} else if(VOLUME > (16*16*16)) {
		UVW_DIVIDE = 16f;
		SPEED = 7500;
	} else {
		UVW_DIVIDE = 1;
		SPEED = 3000;
	}

	// divide
	U /= UVW_DIVIDE;
	V /= UVW_DIVIDE;
	W /= UVW_DIVIDE;

	float u0 = 0;
	float u1 = U;
	float v0 = 0;
	float v1 = V;
	float w0 = 0;
	float w1 = W;

	{
		final long speedL = (long) SPEED;
		final float speedF = SPEED;

		float f4 = Minecraft.getSystemTime() % speedL / speedF;
		float ADD = f4;

		u0 += ADD;
		u1 += ADD;
		v0 += ADD;
		v1 += ADD;
		w0 += ADD;
		w1 += ADD;
	}

	float r = 1;
	float g = 0.5f;
	float b = 0;

	if(a == -1) {
		a = 1;
		r = 0;
		g = 0;
		b = 0;
	}

	if(a == -2) {
		a = 1;
		r = 0;
		g = 1;
		b = 0;
	}

	if(a == -3) {
		a = 1;
		r = 1;
		g = 0.25f;
		b = 0.25f;
	}
	VertexBufferHelper vertexbuffer = new VertexBufferHelper(ren);
	// top
	vertexbuffer.startDrawingQuads();
	vertexbuffer.color(r, g, b, a);
	vertexbuffer.normal(0, 1, 0);
	vertexbuffer.addVertexWithUV(minX, maxY, maxZ, u0, w0);
	vertexbuffer.addVertexWithUV(maxX, maxY, maxZ, u1, w0);
	vertexbuffer.addVertexWithUV(maxX, maxY, minZ, u1, w1);
	vertexbuffer.addVertexWithUV(minX, maxY, minZ, u0, w1);
	// bottom
	vertexbuffer.normal(0, -1, 0);
	vertexbuffer.addVertexWithUV(minX, minY, minZ, u0, w0);
	vertexbuffer.addVertexWithUV(maxX, minY, minZ, u1, w0);
	vertexbuffer.addVertexWithUV(maxX, minY, maxZ, u1, w1);
	vertexbuffer.addVertexWithUV(minX, minY, maxZ, u0, w1);
	// negative z | north
	vertexbuffer.normal(0, 0, -1);
	vertexbuffer.addVertexWithUV(minX, maxY, minZ, u0, v0);
	vertexbuffer.addVertexWithUV(maxX, maxY, minZ, u1, v0);
	vertexbuffer.addVertexWithUV(maxX, minY, minZ, u1, v1);
	vertexbuffer.addVertexWithUV(minX, minY, minZ, u0, v1);
	// positive z | south
	vertexbuffer.normal(0, 0, 1);
	vertexbuffer.addVertexWithUV(maxX, maxY, maxZ, u0, v0);
	vertexbuffer.addVertexWithUV(minX, maxY, maxZ, u1, v0);
	vertexbuffer.addVertexWithUV(minX, minY, maxZ, u1, v1);
	vertexbuffer.addVertexWithUV(maxX, minY, maxZ, u0, v1);
	 //positive x | east
	vertexbuffer.normal(1, 0, 0);
	vertexbuffer.addVertexWithUV(maxX, maxY, minZ, w0, v0);
	vertexbuffer.addVertexWithUV(maxX, maxY, maxZ, w1, v0);
	vertexbuffer.addVertexWithUV(maxX, minY, maxZ, w1, v1);
	vertexbuffer.addVertexWithUV(maxX, minY, minZ, w0, v1);
	 //negative x | west
	vertexbuffer.normal(-1, 0, 0);
	vertexbuffer.addVertexWithUV(minX, maxY, maxZ, w0, v0);
	vertexbuffer.addVertexWithUV(minX, maxY, minZ, w1, v0);
	vertexbuffer.addVertexWithUV(minX, minY, minZ, w1, v1);
	vertexbuffer.addVertexWithUV(minX, minY, maxZ, w0, v1);
	tessellator.draw();
}

private static class VertexBufferHelper {
	private VertexBuffer rend;
	public VertexBufferHelper(VertexBuffer rend) {
		this.rend = rend;
	}

	public void startDrawingQuads() {
		rend.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION_TEX);
	}

	public VertexBuffer pos(double x, double y, double z) {
		return rend.pos(x, y, z);
	}

	public void setTranslation(int x, int y, int z) {
		rend.setTranslation(x, y, z);
	}

	public void addVertexWithUV(double x, double y, double z, float u, float v) {
		rend.pos(x, y, z).tex(u, v).endVertex();

	}

	public void normal(float x, float y, float z) {
		rend.normal(x, y, z);
	}

	public void color(float r, float g, float b, float a) {
		rend.color(r, g, b, a);
	}
}

Bump

 

Here are some images of the problem

 

 

[move]bump[/move]

bumb

sigh.... bump again.

Dear diary,

 

It has been 6 days without a response. I am running low on food and water. The bucket is almost full.

 

 

Bump

If the problem is that it isn't making the correct shape I believe it has to do with the order you specify the vertices. IIRC you have to specify them in counterclockwise order (could be clockwise)

Yup, GL requires vertexes to be added counter-clockwise.

You can change/disable that feature, but you probably shouldn't.