The Draw method in the Sandbox.Graphics class is a static method used to render a set of vertices to the screen. This method is part of the rendering pipeline and is used to draw graphics using a specified material and render attributes. It allows for the rendering of a specified range of vertices from a vertex buffer, using a particular primitive type.
To use the Draw method, you need to provide the following parameters:
vertexBuffer: A GpuBuffer<T> containing the vertices to be drawn. This buffer should be populated with vertex data before calling this method.material: A Material object that defines the appearance of the drawn vertices. This includes shaders and textures.startVertex: An Int32 indicating the starting index in the vertex buffer from which to begin drawing.vertexCount: An Int32 specifying the number of vertices to draw from the vertex buffer.attributes: A RenderAttributes object that provides additional rendering settings and parameters.primitiveType: A Graphics.PrimitiveType enum value that specifies the type of primitive to render, such as triangles, lines, or points.This method does not return a value and is typically called within a rendering loop or a rendering context where the graphics pipeline is set up.
// Example usage of the Draw method
// Assume vertexBuffer is a GpuBuffer<T> that has been populated with vertex data
GpuBuffer<Vertex> vertexBuffer = new GpuBuffer<Vertex>(...);
// Create a material for rendering
Material material = new Material("path/to/shader");
// Define render attributes
RenderAttributes attributes = new RenderAttributes();
// Specify the primitive type
Graphics.PrimitiveType primitiveType = Graphics.PrimitiveType.TriangleList;
// Draw the vertices
Graphics.Draw(vertexBuffer, material, 0, vertexBuffer.Count, attributes, primitiveType);