DemoComplex05.kt

import org.openrndr.WindowMultisample
import org.openrndr.application
import org.openrndr.draw.CullTestPass
import org.openrndr.draw.DrawPrimitive
import org.openrndr.draw.shadeStyle
import org.openrndr.extra.camera.Orbital
import org.openrndr.extra.meshgenerators.*
import org.openrndr.math.Vector3
import org.openrndr.shape.Circle

fun main() {
    application {
        configure {
            width = 800
            height = 800
            multisample = WindowMultisample.SampleCount(8)
        }
        program {
            extend(Orbital()) {
                this.eye = Vector3(0.0, 30.0, 50.0)
            }
            val m = buildTriangleMesh {
                grid(5,5, 5) { u, v, w ->
                    isolated {
                        translate(u * 20.0, v * 20.0, w * 20.0)
                        extrudeShape(Circle(0.0, 0.0, 50.0).shape, 4.0, scale = 0.1)
                    }
                }
                twist(360.0/200.0, 0.0)
                twist(360.0/200.0, 0.0, Vector3.UNIT_X)
                twist(360.0/200.0, 0.0, Vector3.UNIT_Z)
            }

            extend {
                drawer.shadeStyle = shadeStyle {
                    fragmentTransform = """
                        x_fill.rgb *= v_viewNormal.z;
                    """.trimIndent()
                }
                drawer.drawStyle.cullTestPass = CullTestPass.FRONT
                drawer.vertexBuffer(m, DrawPrimitive.TRIANGLES)
            }
        }
    }
}