Java lwjgl 3 drawing a 3d cube code#

GlVertex3f(-1.0f,-1.0f, -1.0f) // Right Of Triangle (Back)ДЇinally we draw the left face. The left point is now green again, because the corner it shares with the right face is green. So make sure you don't add any extra points by accident. If you were to put four points instead of three, OpenGL would draw the first three and assume the fourth point is the start of a new triangle. Once it's drawn three points, if there are three more points, it will assume another triangle needs to be drawn. Because we're making this entire object out of triangles, OpenGL will know that every three points we plot are the three points of a triangle. Notice how the remaining three faces are included inside the same glBegin(GL_TRIANGLES) and glEnd() as the first face. Blending blue outwards from that one corner across both the front and right face of the pyramid. By drawing it blue, it will be the same color as the right bottom corner of the front face. Notice the left point is drawn blue this time. causing the face to slope from center point at the top out to the right side of the screen at the bottom. Notice then the two bottom point are drawn one to the right of center, and the top point is drawn one up on the y axis, and right in the middle of the x axis. By alternating the bottom two colors on each face, we make a common colored point at the bottom of each face. Then the triangle on the right side will have a blue left point and a green right point. The front face will have a green left point and a blue right point. The color on the bottom two points of the triangles will alternate. Because all of the faces share the top point, we will make this point red on all of the triangles. This is important, and will be explained in a future tutorial, for now, just know that it's good practice to make objects either clockwise or counterclockwise, but you shouldn't mix the two unless you have a reason to. Note that all triangles are drawn in a counterclockwise rotation. The top point is right in the middle (zero), and the bottom points are one left from center, and one right from center. The top of the pyramid is one high from the center, the bottom of the pyramid is one down from the center.

Java lwjgl 3 drawing a 3d cube code#

The following code will create the pyramid around a central axis. You have to remember that the center of any object should be 0 on the X, 0 on the Y, and 0 on the Z. In order for your object to spin around an axis, it has to be designed AROUND that axis. One thing I've been asked quite a bit is 'how come my objects are not spinning on their axis? It seems like they are spinning all over the screen'. GlBegin(GL_TRIANGLES) // Start Drawing The PyramidДЄ few of you have taken the code from the last tutorial, and made 3D objects of your own.

GlRotatef(rtri,0.0f,1.0f,0.0f) // Rotate The Pyramid On It's Y Axis GlTranslatef(-1.5f,0.0f,-6.0f) // Move Left And Into The Screen GlClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT) // Clear The Screen And The Depth Buffer

int DrawGLScene(GLvoid) // Here's Where We Do All The Drawing We'll blend the colors on the pyramid, creating a smoothly colored object, and for the square we'll color each face a different color. By doing this, we turn the triangle into a pyramid, and the square into a cube. We will do this by adding a left, back, and right side to the triangle, and a left, right, back, top and bottom to the square. Expanding on the last tutorial, we'll now make the object into TRUE 3D object, rather than 2D objects in a 3D world.