Mapping:Adding a camera to your map

A portal consists of 3 to 4 objects.

First you have an object is a brush you want to be the "viewer".

Then you have 2 entities, the misc_portal_surface and the misc_portal_camera.

This tutorial also uses an entity of target_position which is used to aim your camera, although you can give your misc_portal_camera an angle to aim instead.

Images

Download the following zip file Images it contains 2 images. Extract them tore these in your images folder.

Shader

Add the following shader to your shader file, you should change the paths to match your map.

textures/myfirstmap/tvscreen
{
	qer_editorimage textures/myfirstmap/monitor.tga
	q3map_lightimage textures/myfirstmap/monitor_colour.tga
	q3map_surfacelight 1200
	portal
	{
		map textures/myfirstmap/monitor_colour.tga
		blendFunc filter
		depthWrite
	}
	{
		map textures/myfirstmap/monitor_colour.tga
		blendFunc GL_SRC_ALPHA GL_ONE_MINUS_SRC_ALPHA
		alphagen portal 256
		rgbGen identityLighting	
	}
	{
		map textures/myfirstmap/monitor.tga
		blendfunc blend
	}
	{
		map $lightmap
		blendfunc filter
	}
}

Create a TV screen

Create a simple (detail) brush in your map where you'd like your TV to be.

Texture the top and sides, perhaps the bottom if anyone is likely to look there.

Select the front face, the actual screen of your TV

Apply the monitor.tga to this face and fit it to size.

Create the entities

First of all create an entity of misc_portal_surface and place it within 64 units of your "tv scren" surface.

Then create a misc_portal_camera and place it in the other room.

I am also going to us a target_position to tell the camera where to point. It is also possible to just give the misc_portal_camera an angle, but I find it easier to point it at a target.

Connect the entities together