Autodesk 12812-051462-9011 User Guide 3 - Page 2833

The light view works much like a targeted camera view. You first create the spotlight or directional light and then set the viewport to that light. What you see in the viewport is the view from the light looking into the scene. This is very useful for adjusting the correct distances of hotspot and falloff for the light. Phases of Leg Motion A leg's motion has four phases, beginning with the foot on the ground. Then the foot lifts, moves through the air, and returns to the ground again. Biped divides this motion into four phases, as follows: ■ Touch Occurs at the leg keyframe where the leg's foot first touches the ground and always corresponds with the start frame of a footstep in Track View - Dope Sheet. ■ Plant Occurs after touching, and before lifting. It is always in between the start and end frames of a footstep in Track View - Dope Sheet. ■ Lift Occurs at the keyframe where the leg's foot lifts off the ground, and always corresponds to the end frame of each footstep in Track View - Dope Sheet. ■ Move Occurs while the foot is in the air and is always in the intervals in between steps in Track View - Dope Sheet. In walking, while one foot moves, the body is supported by the other leg. In running or jumping, while a foot moves there is a period where the body is not supported, and moves in midair. Photometry When you use photometric lights on page 5005, 3ds Max provides physically based simulation of the propagation of light through an environment. The results are not only highly realistic renderings, but also accurate measurements of the distribution of light within the scene. The measurement of light is known as photometry. This topic introduces the quantities used for defining and measuring light. There are several theories that describe the nature of light. For this discussion, we define light as radiant energy capable of producing a visual sensation in a human observer. When we design a lighting system, we're interested in evaluating its effect on the human visual response system. Thus photometry 8088 | Glossary