Problem with JOGL picking after using glTranslate

OpenGL Development JOGL Development
#1

I decided to re-use my topic instead of spam the board since it’s not really that active, so i just edited this.

The following posts were to do with my original problem so it hasn’t been answered yet.

Anyway…

Im having a problem with Picking/Selecting whatever you want to call it, i had it working perfectly but if i want to move the drawing of the model then it dosn’t work.

Here is the method to render the vertices of the model which IS VISIBLE, not the picking method;

public void renderVertices(GL gl)
	{	
		gl.glPushMatrix();
		gl.glTranslatef(5f, 0.0f, 0f);
		//gl.glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
		gl.glDisable(GL.GL_LIGHTING);
		gl.glBegin(GL.GL_QUADS);	
		for (Vertex v : vertices)
		{
			gl.glColor3f(0.0f, 0.5f, 0.0f);
			float xMinus = v.x - 0.01f;
			float yMinus = v.y - 0.02f;
			float zMinus = v.z - 0.01f;
			float xPlus = v.x + 0.01f;
			float yPlus = v.y;
			float zPlus = v.z + 0.01f;
			gl.glVertex3f(xPlus, yPlus, zPlus);
			gl.glVertex3f(xPlus, yMinus, zPlus);
			gl.glVertex3f(xPlus, yMinus, zMinus);
			gl.glVertex3f(xPlus, yPlus, zMinus);
			gl.glVertex3f(xPlus, yPlus, zMinus);
			gl.glVertex3f(xPlus, yMinus, zMinus);
			gl.glVertex3f(xMinus, yMinus, zMinus);
			gl.glVertex3f(xMinus, yPlus, zMinus);
			gl.glVertex3f(xMinus, yPlus, zMinus);
			gl.glVertex3f(xMinus, yMinus, zMinus);
			gl.glVertex3f(xMinus, yMinus, zPlus);
			gl.glVertex3f(xMinus, yPlus, zPlus);
			gl.glVertex3f(xMinus, yPlus, zPlus);
			gl.glVertex3f(xMinus, yMinus, zPlus);
			gl.glVertex3f(xPlus, yMinus, zPlus);
			gl.glVertex3f(xPlus, yPlus, zPlus);
			gl.glVertex3f(xMinus, yPlus, zMinus);
			gl.glVertex3f(xMinus, yPlus, zPlus);
			gl.glVertex3f(xPlus, yPlus, zPlus);
			gl.glVertex3f(xPlus, yPlus, zMinus);
			gl.glVertex3f(xMinus, yMinus, zPlus);
			gl.glVertex3f(xMinus, yMinus, zMinus);
			gl.glVertex3f(xPlus, yMinus, zMinus);
			gl.glVertex3f(xPlus, yMinus, zPlus);
		}
		gl.glEnd();
		gl.glPopMatrix();
		gl.glEnable(GL.GL_LIGHTING);
	}

Picking works perfectly if i take out the translation and rotation parts.

Here is the method for rendering the vertices using picking, i have made it so that it performs a loop so i can set the “names” for each vertice by doing;


gl.glPushName(index);
model.renderVertice(index, gl);
gl.glPopName();

index being the variable of the for statement.

So anyway, here is the picking rendering method;

public void renderVertex(int index, GL gl)
	{
		gl.glDisable(GL.GL_LIGHTING);
		gl.glPushMatrix();
		gl.glTranslatef(5f, 0.0f, 0f);
		//gl.glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
		Vertex v = vertices[index];
		gl.glBegin(GL.GL_QUADS);
		float xMinus = v.x - 0.01f;
		float yMinus = v.y - 0.02f;
		float zMinus = v.z - 0.01f;
		float xPlus = v.x + 0.01f;
		float yPlus = v.y;
		float zPlus = v.z + 0.01f;
		gl.glVertex3f(xPlus, yPlus, zPlus);
		gl.glVertex3f(xPlus, yMinus, zPlus);
		gl.glVertex3f(xPlus, yMinus, zMinus);
		gl.glVertex3f(xPlus, yPlus, zMinus);
		gl.glVertex3f(xPlus, yPlus, zMinus);
		gl.glVertex3f(xPlus, yMinus, zMinus);
		gl.glVertex3f(xMinus, yMinus, zMinus);
		gl.glVertex3f(xMinus, yPlus, zMinus);
		gl.glVertex3f(xMinus, yPlus, zMinus);
		gl.glVertex3f(xMinus, yMinus, zMinus);
		gl.glVertex3f(xMinus, yMinus, zPlus);
		gl.glVertex3f(xMinus, yPlus, zPlus);
		gl.glVertex3f(xMinus, yPlus, zPlus);
		gl.glVertex3f(xMinus, yMinus, zPlus);
		gl.glVertex3f(xPlus, yMinus, zPlus);
		gl.glVertex3f(xPlus, yPlus, zPlus);
		gl.glVertex3f(xMinus, yPlus, zMinus);
		gl.glVertex3f(xMinus, yPlus, zPlus);
		gl.glVertex3f(xPlus, yPlus, zPlus);
		gl.glVertex3f(xPlus, yPlus, zMinus);
		gl.glVertex3f(xMinus, yMinus, zPlus);
		gl.glVertex3f(xMinus, yMinus, zMinus);
		gl.glVertex3f(xPlus, yMinus, zMinus);
		gl.glVertex3f(xPlus, yMinus, zPlus);
		gl.glEnd();
		gl.glPopMatrix();
		gl.glEnable(GL.GL_LIGHTING);
	}

Like i said, if i don’t add the translation part it works fine, but it’s included in both methods so im not sure why it’s not working.

Thanks for any help.

#2

it’s probably the lighting.

the screenshot below is definitely rendered without lighting. and the function enables lighting at the very end.

have a look at the setup of your lights!

#3

no light is expected no ?

and the following will set vertex color painting no ?

gl.glColor3f(t.getRed(), t.getGreen(), t.getBlue());

try to replace by:

gl.glColor3f(1.0f,1.0f,1.0f);
#4

That just colours the vertices of the floor tiles which can be rendered before or after and still cause the problem.

#5

I know but your dwarf warrior seems as the tiles a little colored too

#6

Ok thanks i put that at the end and it worked.

Now, would you know how to draw the mesh, or outlines of the model but not actually colour it?

I was thinking about using gl.glDrawLine but it would be harder having to join vertex 1-2, 2-3, 3-4, 4-5, 5-1 or however many vertices there are in each polygon.

#7

Before rendering the shape, call gl.glPolygonMode(GL.GL_FRONT_AND_BACK, GL.GL_LINE) before you draw everything normally. This causes front and back facing polygons to be rendered as a wireframe. To turn it back to solid polygons use GL.GL_FILL instead of GL_LINE. You can also use GL_FRONT and GL_BACK instead of GL_FRONT_AND_BACK to control the mode for individual facings.

HTH

#8

Ok i changed the question.

#9

I would create a new post