DemoWireframe01.kt

/**
Display wireframe and non-planar faces
 */
import org.openrndr.WindowMultisample
import org.openrndr.application
import org.openrndr.color.ColorRGBa
import org.openrndr.draw.DrawPrimitive
import org.openrndr.draw.TransformTarget
import org.openrndr.draw.shadeStyle
import org.openrndr.extra.camera.Orbital
import org.openrndr.extra.objloader.readObjMeshData
import org.openrndr.extra.objloader.loadOBJasVertexBuffer
import org.openrndr.extra.mesh.wireframe
import org.openrndr.math.Vector3
import org.openrndr.shape.Path3D
import java.io.File
import kotlin.math.cos

fun main() {
    application {
        configure {
            width = 720
            height = 720
            multisample = WindowMultisample.SampleCount(4)
        }
        program {
            val vb = loadOBJasVertexBuffer("orx-obj-loader/test-data/non-planar.obj")
            val md = readObjMeshData(File("orx-obj-loader/test-data/non-planar.obj").readLines())

            val paths = md.wireframe().map {
                Path3D.fromPoints(it, true)
            }

            extend(Orbital())
            extend {
                drawer.rotate(Vector3.Companion.UNIT_Y, seconds * 45.0 + 45.0, TransformTarget.MODEL)
                drawer.translate(0.0, 0.0, 9.0, TransformTarget.VIEW)
                drawer.shadeStyle = shadeStyle {
                    fragmentTransform = """
                        x_fill.rgb = normalize(v_viewNormal) * 0.5 + vec3(0.5);
                    """.trimIndent()
                }

                drawer.vertexBuffer(vb, DrawPrimitive.TRIANGLES)
                drawer.stroke = ColorRGBa.WHITE
                drawer.strokeWeight = 1.0

                drawer.shadeStyle = shadeStyle {
                    vertexTransform = """
                        x_projectionMatrix[3][2] -= 0.001;
                    """.trimIndent()
                }

                drawer.strokeWeight = 1.0
                drawer.paths(paths.mapIndexed { index, it ->
                    it.sub(
                        0.0, cos(seconds * 0.5 + index * 0.5) * 0.5 + 0.5
                    )
                })
            }
        }
    }
}