GPU Pro 4

56 II Rendering

Figure 1.4. Editor view showing the link between an image proxy and a cubemap (left)

and the orthogonal frustum for a 2D scene capture (right).

Creating image proxies. An image proxy is a quad textured with an authored

image or a 2D capture from the scene. The quad is used as a geometric approxi-

mation of the reflection environment a.k.a. the geometry proxy.

We developed tools for our artists to allow placing image proxies in levels,

customizing the quad size, customizing the texture resolution and performing 2D

scene captures (Figure 1.4). The 2D capture is done with an orthogonal frustum

set up inside our game editor. The capture