Description
Low-level graphics library.
Use this class to manipulate active transformation matrices,
issue rendering commands similar to OpenGL's immediate mode and do other low-level
graphics tasks. Note that in almost all cases using Graphics.DrawMesh is more efficient than
using immediate mode drawing.
GL immediate drawing functions use whatever is the "current material" set up right now.
The material controls how the rendering is done (blending, textures, etc.), so unless you explicitly
set it to something before using GL draw functions, the material can happen to be anything.
Also, if you call any other drawing commands from inside GL drawing code, they can set
material to something else, so make sure it's under control as well.
GL drawing commands execute immediately. That means if you call them in Update(), they will be executed
before the camera is rendered (and the camera will most likely clear the screen, making the GL drawing
not visible).
The usual place to call GL drawing is most often in OnPostRender() from a script attached to a camera
static var lineMaterial : Material;static function CreateLineMaterial() {
if( !lineMaterial ) {
lineMaterial = new Material( "Shader \"Lines/Colored Blended\" {" +
"SubShader { Pass { " +
" Blend SrcAlpha OneMinusSrcAlpha " +
" ZWrite Off Cull Off Fog { Mode Off } " +
" BindChannels {" +
" Bind \"vertex\", vertex Bind \"color\", color }" +
"} } }" );
lineMaterial.hideFlags = HideFlags.HideAndDontSave;
lineMaterial.shader.hideFlags = HideFlags.HideAndDontSave;
}
}function OnPostRender() {
CreateLineMaterial();
// set the current material
lineMaterial.SetPass( 0 );
GL.Begin( GL.LINES );
GL.Color( Color(1,1,1,0.5) );
GL.Vertex3( 0, 0, 0 );
GL.Vertex3( 1, 0, 0 );
GL.Vertex3( 0, 1, 0 );
GL.Vertex3( 1, 1, 0 );
GL.Color( Color(0,0,0,0.5) );
GL.Vertex3( 0, 0, 0 );
GL.Vertex3( 0, 1, 0 );
GL.Vertex3( 1, 0, 0 );
GL.Vertex3( 1, 1, 0 );
GL.End();
}
Note: This class is almost always used when you need to draw a couple of lines or triangles, and don't want to deal with meshes.
If you want to avoid surprises the usage pattern is this:
function OnPostRender() {
// Set your materials GL.PushMatrix();
// yourMaterial.SetPass( );
// Draw your stuff
GL.PopMatrix();
}
Where at the "// Draw your stuff" you should do SetPass() on some material previously declared, which will be used for drawing.
If you dont call SetPass, then you'll get basically a random material (whatever was used before) which is not good. So do it.
Begin |
Begin drawing 3D primitives. |
Clear |
Clear the current render buffer. |
ClearWithSkybox |
Clear the current render buffer with camera's skybox. |
Color |
Sets current vertex color. |
End |
End drawing 3D primitives. |
GetGPUProjectionMatrix |
Compute GPU projection matrix from camera's projection matrix. |
InvalidateState |
Invalidate the internally cached renderstates. |
IssuePluginEvent |
Send a user-defined event to a native code plugin. |
LoadIdentity |
Load the identity matrix to the current modelview matrix. |
LoadOrtho |
Helper function to set up an ortho perspective transform. |
LoadPixelMatrix |
Setup a matrix for pixel-correct rendering. |
LoadProjectionMatrix |
Load an arbitrary matrix to the current projection matrix. |
MultiTexCoord |
Sets current texture coordinate (v.x,v.y,v.z) to the actual texture unit. |
MultiTexCoord2 |
Sets current texture coordinate (x,y) for the actual texture unit. |
MultiTexCoord3 |
Sets current texture coordinate (x,y,z) to the actual texture unit. |
MultMatrix |
Multiplies the current modelview matrix with the one specified. |
PopMatrix |
Restores both projection and modelview matrices off the top of the matrix stack. |
PushMatrix |
Saves both projection and modelview matrices to the matrix stack. |
SetRevertBackfacing |
Select whether to invert the backface culling (true) or not (false). |
TexCoord |
Sets current texture coordinate (v.x,v.y,v.z) for all texture units. |
TexCoord2 |
Sets current texture coordinate (x,y) for all texture units. |
TexCoord3 |
Sets current texture coordinate (x,y,z) for all texture units. |
Vertex |
Submit a vertex. |
Vertex3 |
Submit a vertex. |
Viewport |
Set the rendering viewport. |