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Rendering Basics

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Rendering Basics

In TouchDesigner, rendering involves converting 3D geometry (SOPs), materials (MATs), lighting, and camera perspectives into a 2D image (TOP).

The Core Pipeline

A standard 3D rendering pipeline requires four main components:

  1. Geometry (SOP): A 3D model, e.g., a Sphere SOP. It must be placed inside a Geometry COMP (or have its display/render flags active if it’s already inside one).
  2. Camera COMP: Defines the perspective and view frustum from which the scene is observed.
  3. Light COMP: Illuminates the scene. Without lighting, materials using typical phong shading will appear completely black.
  4. Render TOP: The node that actually computes the final image, taking the Camera, Geometry, and Light(s) as its inputs.

Specialized Rendering: POP Render TOP

For high-performance point clouds and particles processed via POP - Point Operators, a specialized POP Render TOP is used. This bypasses the traditional Camera/Light pipeline to efficiently draw millions of points onto a 2D image, often utilizing GPU-based vertex and fragment logic for maximum speed.

Render Settings

The Render TOP has several crucial parameters on its setup pages:

  • Resolution: By default, it inherits from its inputs or uses a preset (like 1280x720). You can customize this in the Common page.
  • Pixel Format: 8-bit, 16-bit float, or 32-bit float. Use higher bit depths for HDR imaging, feedback loops, or precise depth passes.
  • Anti-alias: Smooths the jagged edges of geometry. Higher values cost more performance.

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