Abstract: A computer-based method for generating vegetation such as 3D models of trees. The method includes providing in memory a template with model growth rules. A computer processor positions a seed particle in a location in digital 3D space. The base particle is associated with a set of attributes stored in the memory, such as attributes or values provided in the template. A generator module generates the tree model (e.g. a particle system) using a particle-based growth process starting with the seed. The particle growth includes iteratively generating additional particles and also includes gathering environmental data regarding the 3D space for the particles. Then, the method includes determining a move direction for each particle based on the growth rules evaluated with the environmental data The particles are moved to new positions using the move direction, and these steps are continued through time steps to create the tree model.

Abstract: An image data editing facility produces a sequence of output image frames. A wipe animation is produced over a sequence of output frames such that an increasing proportion of the output image is derived from a second sequence of frames and a decreasing proportion of the output image is derived from a first sequence of frames, under the control of a moving boundary defined by a wipe animation. The rate of expansion of boundary is controlled with reference to an animation parameter and the animation parameter is derived from processing at least one stored position parameter with reference to a selected animation starting location.