İçindekiler
Bu bölümde, başka bir basit ışık kaynağı olan yönlü ışığı ele alacağız. Bu, projektör gibi sonsuz paralel bir ışık kaynağını temsil eder. Yönü, dönüşüm matrisinin dönüş kısmı tarafından belirlenir.
Belirli parametreler #
LightDirect eklenti türü, Light Rectangle bölümünde açıklanan tüm ortak parametrelerin yanı sıra Light Omni’ye özgü parametreleri de ( decayma hariç ) içerir. Yönlü ışık için iki özel parametre daha vardır:
-
storeWithIrradianceMap – Bu seçenek açık olduğunda ve GI hesaplaması Işınım haritası olarak ayarlandığında, V-Ray bu ışığın etkilerini hesaplayacak ve bunları ışınım haritasına kaydedecektir. Sonuç olarak, ışınım haritası daha yavaş hesaplanır ancak işleme daha az zaman alır. Işınım haritasını kaydedip daha sonra tekrar kullanabilirsiniz.
-
beamRadius – Işığın etrafındaki ışın yarıçapı. Bu yalnızca kostikler için fotonların nereden fırlatılacağını belirler. Işını devre dışı bırakmak istiyorsanız 0.0 olarak ayarlayın.
Örnek #
Burada bir sahneye LightDirect’i nasıl ekleyeceğinizi göstereceğiz .
# Compatibility with Python 2.7.
from __future__ import print_function
# The directory containing the vray shared object should be present in the PYTHONPATH environment variable.
# Try to import the vray module from VRAY_SDK/python, if it is not in PYTHONPATH
import sys, os
VRAY_SDK = os.environ.get('VRAY_SDK')
if VRAY_SDK:
sys.path.append(os.path.join(VRAY_SDK, 'python'))
import vray
SCENE_PATH = os.path.join(os.environ.get('VRAY_SDK'), 'scenes')
# Change process working directory to SCENE_PATH in order to be able to load relative scene resources.
os.chdir(SCENE_PATH)
# The renderer is automatically closed after the `with` block.
with vray.VRayRenderer() as renderer:
# Register a simple log callback. Always useful for debugging.
def dumpMsg(renderer, message, level, instant):
if level == vray.LOGLEVEL_ERROR:
print("[ERROR]", message)
elif level == vray.LOGLEVEL_WARNING:
print("[Warning]", message)
elif level == vray.LOGLEVEL_INFO:
print("[info]", message)
# Uncomment for testing, but you might want to ignore these in real code
#else: print("[debug]", message)
renderer.setOnLogMessage(dumpMsg)
# Load scene from a file.
renderer.load(os.path.join(SCENE_PATH, 'lighting.vrscene'))
# Remove original light source from the scene.
del renderer.plugins["VRayLightDomeShape1"]
# LightDirect is a light source plugin that can be used to create physically accurate lights that cast rays from a specific direction.
light = renderer.classes.LightDirect()
# Specify the light position, rotation and scale.
light.transform = vray.Transform(
vray.Matrix(
vray.Vector(-0.9715043, -1.387779e-017, 0.2370218),
vray.Vector(0.1674119, 0.7078983, 0.6861874),
vray.Vector(-0.1677873, 0.7063142, -0.6877262)),
vray.Vector(0, 107.949804287337, 0))
# Specify the color of the light in RGB float values and alpha(1.0f)
light.color = vray.AColor(1, 1, 1)
# Specify the light intensity based on the 'units' parameter.
light.intensity = 3
# Controls the softness of the shadows. Bigger values will produce softer shadows.
light.spreadAngle = 0.176327
# Specify shadow offset from the surface. Helps to prevent polygonal shadow artifacts on low-poly surfaces.
light.shadowBias = 0.02
# Start rendering.
renderer.startSync()
# Wait for rendering to end.
renderer.waitForRenderEnd()
#define VRAY_RUNTIME_LOAD_PRIMARY
#include "vraysdk.hpp"
#include "vrayplugins.hpp"
#include "utils.h"
using namespace VRay;
using namespace VRay::Plugins;
using namespace std;
const char *BASE_PATH = getenv("VRAY_SDK");
string SCENE_PATH = (BASE_PATH ? string(BASE_PATH) : string(".")) + PATH_DELIMITER + "scenes";
int main() {
// Change process working directory to SCENE_PATH in order to be able to load relative scene resources.
changeCurrentDir(SCENE_PATH.c_str());
// Load V-Ray SDK library.
VRayInit init(NULL, true);
// Create an instance of VRayRenderer with default options.
// The renderer is automatically closed at the end of the current scope.
VRayRenderer renderer;
// It's recommended to always have a console log
renderer.setOnLogMessage(logMessage);
// Load scene from a file.
renderer.load("lighting.vrscene");
// Remove original light source from the scene.
renderer.deletePlugin("VRayLightDomeShape1");
// LightDirect is a light source plugin that can be used to create physically accurate lights that cast rays from a specific direction.
LightDirect light = renderer.newPlugin<LightDirect>();
// Specify the light position, rotation and scale.
light.set_transform(Transform(
Matrix(
Vector(-0.9715043, -1.387779e-017, 0.2370218),
Vector(0.1674119, 0.7078983, 0.6861874),
Vector(-0.1677873, 0.7063142, -0.6877262)),
Vector(0.0, 107.949804287337, 0.0)));
// Specify the color of the light in RGB float values and alpha(1.0f)
light.set_color(AColor(1.0, 1.0, 1.0));
// Specify the light intensity based on the 'units' parameter.
light.set_intensity(3);
// Controls the softness of the shadows. Bigger values will produce softer shadows.
light.set_spreadAngle(0.176327f);
// Specify shadow offset from the surface. Helps to prevent polygonal shadow artifacts on low-poly surfaces.
light.set_shadowBias(0.02f);
// Start rendering.
renderer.startSync();
// Wait for rendering to end.
renderer.waitForRenderEnd();
return 0;
}
using System;
using System.IO;
using VRay;
using VRay.Plugins;
namespace _07_direct
{
class Program
{
static void Main(string[] args)
{
string SCENE_PATH = Path.Combine(Environment.GetEnvironmentVariable("VRAY_SDK"), "scenes");
// Change process working directory to SCENE_PATH in order to be able to load relative scene resources.
Directory.SetCurrentDirectory(SCENE_PATH);
// Create an instance of VRayRenderer with default options. The renderer is automatically closed after the `using` block.
using (VRayRenderer renderer = new VRayRenderer())
{
// Add a listener for any type of log message.
renderer.LogMessage += new EventHandler<MessageEventArgs>((source, e) =>
{
// You can remove the if for testing, but you might want to ignore Debug in real code
if (e.LogLevel != LogLevelType.Debug)
{
Console.WriteLine(String.Format("[{0}] {1}", e.LogLevel.ToString(), e.Message));
}
});
// Load scene from a file.
renderer.Load("lighting.vrscene");
// Remove original light source from the scene.
renderer.DeletePlugin("VRayLightDomeShape1");
// LightDirect is a light source plugin that can be used to create physically accurate lights that cast rays from a specific direction.
LightDirect light = renderer.NewPlugin<LightDirect>();
// Specify the light position, rotation and scale.
light.Transform = new Transform(
new Matrix(
new Vector(-0.9715043, -1.387779e-017, 0.2370218),
new Vector(0.1674119, 0.7078983, 0.6861874),
new Vector(-0.1677873, 0.7063142, -0.6877262)),
new Vector(0, 107.949804287337, 0));
// Specify the color of the light in RGB float values and alpha = 1.
light.Color = new AColor(1, 1, 1);
// Specify the light intensity based on the 'units' parameter.
light.Intensity = 3;
// Controls the softness of the shadows. Bigger values will produce softer shadows.
light.SpreadAngle = 0.176327F;
// Specify shadow offset from the surface. Helps to prevent polygonal shadow artifacts on low-poly surfaces.
light.ShadowBias = 0.02F;
// Start rendering.
renderer.StartSync();
// Wait for rendering to end.
renderer.WaitForRenderEnd();
}
}
}
}
var path = require('path');
var vray = require(path.join(process.env.VRAY_SDK, 'node', 'vray'));
var SCENE_PATH = path.join(process.env.VRAY_SDK, 'scenes');
// Change process working directory to SCENE_PATH in order to be able to load relative scene resources.
process.chdir(SCENE_PATH);
// Create an instance of VRayRenderer with default options.
var renderer = vray.VRayRenderer();
// It's recommended to always have a console log callback
renderer.on("logMessage", function(message, level, instant) {
if (level == vray.LOGLEVEL_ERROR)
console.log("[ERROR] ", message);
else if (level == vray.LOGLEVEL_WARNING)
console.log("[Warning] ", message);
else if (level == vray.LOGLEVEL_INFO)
console.log("[info] ", message);
// Uncomment for testing, but you might want to ignore these in real code
//else console.log("[debug] ", message);
});
// Load scene from a file asynchronously.
renderer.load("lighting.vrscene", function(err) {
if (err) throw err;
// Remove original light source from the scene.
delete renderer.plugins["VRayLightDomeShape1"];
// LightDirect is a light source plugin that can be used to create physically accurate lights that cast rays from a specific direction.
var light = renderer.classes.LightDirect();
// Specify the light position, rotation and scale.
light.transform = vray.Transform(
vray.Matrix(
vray.Vector(-0.9715043, -1.387779e-017, 0.2370218),
vray.Vector(0.1674119, 0.7078983, 0.6861874),
vray.Vector(-0.1677873, 0.7063142, -0.6877262)),
vray.Vector(0, 107.949804287337, 0));
// Specify the color of the light in RGB float values and alpha(1.0f)
light.color = vray.AColor(1, 1, 1);
// Specify the light intensity based on the 'units' parameter.
light.intensity = 3;
// Controls the softness of the shadows. Bigger values will produce softer shadows.
light.spreadAngle = 0.176327;
// Specify shadow offset from the surface. Helps to prevent polygonal shadow artifacts on low-poly surfaces.
light.shadowBias = 0.02;
// Start rendering.
renderer.start(function(err) {
if (err) throw err;
// Wait for rendering to end.
renderer.waitForRenderEnd(function() {
renderer.close();
});
});
});
Sonuç #
Bu render için kullanılan sahne “Lighting_Direct.vrscene” olarak adlandırılır ve sahne paketinde bulunabilir (içinde bulunan farklı parametrelere ilişkin yorumlar mevcuttur).
Gördüğünüz gibi, yönlü ışık başlangıçta çok fazla gürültü çıkarıyor.
