I'm rendering some things in RenderWorldLastEvent and would like to have fog applied to them. However when I enable fog, it originates from vertex position instead of player position.

Here's my code:

Tessellator tess = Tessellator.getInstance();
BufferBuilder buffer = tess.getBuffer();

GlStateManager.pushMatrix();
RenderHelper.translateToZero();

GlStateManager.disableTexture2D();
GlStateManager.color(1, 0, 0);
GlStateManager.disableCull();
GlStateManager.enableFog();

buffer.begin(GL11.GL_QUADS, DefaultVertexFormats.POSITION);

buffer.pos(0, 100, 0).endVertex();
buffer.pos(-1.1, 100, 0).endVertex();
buffer.pos(-100, 100, 0).endVertex();
buffer.pos(-101.1, 100, 0).endVertex();

tess.draw();

GlStateManager.disableFog();
GlStateManager.enableCull();
GlStateManager.enableTexture2D();

GlStateManager.popMatrix();

And this is the translateToZero() method:

public static void translateToZero() {
	Entity entity = mc.getRenderViewEntity();
	float partialTicks = mc.getRenderPartialTicks();

	GlStateManager.translate(
		-(entity.lastTickPosX + (entity.posX - entity.lastTickPosX) * (double)partialTicks),
		-(entity.lastTickPosY + (entity.posY - entity.lastTickPosY) * (double)partialTicks),
		-(entity.lastTickPosZ + (entity.posZ - entity.lastTickPosZ) * (double)partialTicks)
	);
}

Do I need to draw my quads in a different way? I've never done anything with OpenGL fog.

Edited October 19, 20178 yr by Silly511

Bump.

Bump again.

You might want to contact TheGreyGhost. He does a fair bit with GL.

 

Otherwise, you need to debug the old fashioned way. You are already right to be suspicious of the translate to zero method. So maybe print out the values and get a sense of what is happening. I expect it is something wrong with the math that will become obvious.

 

For example one thing may be that by the time the render happens the current position and the last tick position may be equal to each other (since at some point in the tick the last tick position must copy the current position and the current position will get updated later). That's my guess.