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POAndroid openGL ES normals
 

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  1. POAndroid openGL ES normals
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    <p>So yesterday I wrote WaveFront .obj 3D model loader which now works fine(doesn't support everything tho) so I wrote simple test to draw any 3D model on the screen which all worked fine until I was adding lighting to the scene. The light appeared but it seems like the normals are still in their default state. I am very unsure what should i use as target when generating buffers(as theres GL_NORMAL_ARRAY, GL_ARRAY_BUFFER etc.) for normals as I couldn't find any tutorial about it using buffer objects for those:</p> <pre><code>package com.Ruuhkis.opengl; import static javax.microedition.khronos.opengles.GL10.GL_COLOR_BUFFER_BIT; import static javax.microedition.khronos.opengles.GL10.GL_VERTEX_ARRAY; import java.nio.ByteBuffer; import java.nio.ByteOrder; import java.nio.FloatBuffer; import java.nio.ShortBuffer; import javax.microedition.khronos.egl.EGLConfig; import javax.microedition.khronos.opengles.GL10; import javax.microedition.khronos.opengles.GL11; import android.content.Context; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.graphics.BitmapFactory.Options; import android.opengl.GLSurfaceView.Renderer; import android.opengl.GLU; import android.opengl.GLUtils; import android.util.Log; import com.Ruuhkis.opengl.model.Indices; import com.Ruuhkis.opengl.model.Loader; import com.Ruuhkis.opengl.model.Model; import com.Ruuhkis.opengl.model.Polygon; import com.Ruuhkis.opengl.model.Vertex; public class TextureRenderer implements Renderer { private FloatBuffer vertexBuffer, normalBuffer; private ShortBuffer indexBuffer; private int attribVBO, attribIBO, attribNBO; private Context context; private float rotation = 0; private float[] vertices = {-0.8f, -0.8f, 0f, 0.8f, -0.8f, 0f, 0.8f, 0.8f, 0f, -0.8f, 0.8f, 0f}; private float[] normals = {0f}; private short[] indices = {0, 3, 2, 0, 2, 1}; public TextureRenderer(Context context) { this.context = context; Model model = Loader.loadModel(context.getAssets(), "test.txt"); vertices = new float[model.getVerticeList().size() * 3]; int i = 0; for(Vertex v: model.getVerticeList()) { vertices[i++] = v.getX(); vertices[i++] = v.getY(); vertices[i++] = v.getZ(); //Log.v("vertice", v.toString() + " sa"); } i = 0; indices = new short[model.getPolygonList().size() * 3]; normals = new float[model.getPolygonList().size() * 3]; for(Polygon p: model.getPolygonList()) { for(Indices in: p.getIndiceList()) { normals[i] = vertices[in.getNormalIndex()]; indices[i++] = (short) in.getVertexIndex(); } } ByteBuffer buffer = ByteBuffer.allocateDirect(vertices.length * 4); buffer.order(ByteOrder.nativeOrder()); vertexBuffer = buffer.asFloatBuffer(); vertexBuffer.put(vertices); vertexBuffer.flip(); buffer = ByteBuffer.allocateDirect(normals.length * 4); buffer.order(ByteOrder.nativeOrder()); normalBuffer = buffer.asFloatBuffer(); normalBuffer.put(normals); normalBuffer.flip(); buffer = ByteBuffer.allocateDirect(indices.length * 2); buffer.order(ByteOrder.nativeOrder()); indexBuffer = buffer.asShortBuffer(); indexBuffer.put(indices); indexBuffer.flip(); } @Override public void onDrawFrame(GL10 gl) { gl.glColor4f(1f, 0f, 0f, 1f); gl.glClear(GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT); gl.glLoadIdentity(); gl.glPushMatrix(); gl.glTranslatef(0f, 0f, -10f); rotation += 1f; gl.glRotatef(rotation, 1f, 1f, 0f); gl.glEnableClientState(GL_VERTEX_ARRAY); gl.glEnableClientState(GL11.GL_NORMAL_ARRAY); GL11 gl11 = (GL11) gl; gl11.glBindBuffer(GL11.GL_ARRAY_BUFFER, attribVBO); gl11.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, attribIBO); gl11.glBindBuffer(GL11.GL_NORMAL_ARRAY, attribNBO); gl11.glVertexPointer(3, GL10.GL_FLOAT, 0, 0); gl11.glNormalPointer(3, GL10.GL_FLOAT, 0); gl11.glDrawElements(GL10.GL_TRIANGLES, indices.length, GL10.GL_UNSIGNED_SHORT, 0); gl.glDisableClientState(GL11.GL_NORMAL_ARRAY); gl.glDisableClientState(GL_VERTEX_ARRAY); gl.glPopMatrix(); gl.glFlush(); } @Override public void onSurfaceChanged(GL10 gl, int width, int height) { gl.glViewport(0, 0, width, height); gl.glMatrixMode(GL10.GL_PROJECTION); gl.glLoadIdentity(); GLU.gluPerspective(gl, 45f, (float)width / (float)height, 1f, 100f); gl.glMatrixMode(GL10.GL_MODELVIEW); gl.glEnable(GL10.GL_DEPTH_TEST); //gl.glEnable(GL10.GL_LIGHTING); gl.glEnable(GL10.GL_LIGHTING); gl.glEnable(GL10.GL_LIGHT1); gl.glEnable(GL10.GL_COLOR_MATERIAL); gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_AMBIENT, FloatBuffer.wrap(new float[]{0f, 0f, 0f, 1f})); gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_DIFFUSE, FloatBuffer.wrap(new float[]{1f, 1f, 1f, 1f})); gl.glLightfv(GL10.GL_LIGHT1, GL10.GL_SPECULAR, FloatBuffer.wrap(new float[]{1f, 1f, 1f, 1f})); gl.glMaterialfv(GL10.GL_FRONT, GL10.GL_SPECULAR, FloatBuffer.wrap(new float[]{1f, 1f, 1f, 1f})); gl.glMaterialf(GL11.GL_FRONT, GL11.GL_SHININESS,128f); gl.glShadeModel(GL10.GL_SMOOTH); } @Override public void onSurfaceCreated(GL10 gl, EGLConfig config) { gl.glClearColor(0.8f, 0.8f, 0.8f, 1f); GL11 gl11 = (GL11) gl; int[] buffer = new int[1]; gl11.glGenBuffers(1, buffer, 0); attribVBO = buffer[0]; gl11.glBindBuffer(GL11.GL_ARRAY_BUFFER, attribVBO); gl11.glBufferData(GL11.GL_ARRAY_BUFFER, vertices.length * 4, vertexBuffer, GL11.GL_STATIC_DRAW); gl11.glBindBuffer(GL11.GL_ARRAY_BUFFER, -1); gl11.glGenBuffers(1, buffer, 0); attribIBO = buffer[0]; gl11.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, attribIBO); gl11.glBufferData(GL11.GL_ELEMENT_ARRAY_BUFFER, indices.length * 2, indexBuffer, GL11.GL_STATIC_DRAW); gl11.glBindBuffer(GL11.GL_ELEMENT_ARRAY_BUFFER, -1); gl11.glGenBuffers(1, buffer, 0); attribNBO = buffer[0]; gl11.glBindBuffer(GL11.GL_NORMAL_ARRAY, attribNBO); gl11.glBufferData(GL11.GL_NORMAL_ARRAY, normals.length * 4, normalBuffer, GL11.GL_STATIC_DRAW); gl11.glBindBuffer(GL11.GL_NORMAL_ARRAY, -1); } } </code></pre> <p><img src="https://i.stack.imgur.com/azDkv.png" alt="enter image description here"></p> <p>so, the default normals are 0, 0, -1 or 0, 0, 1 and the default camera is looking at -5, and as the model rotates the light just goes away just like it is when theres no normals, I've got something similar to this work with computer but i didn't use VBOs etc. so I can't compare the code, I am pretty sure theres something wrong with uploading the normal buffer or binding it! :( help me! :(</p>
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    1. COJust a quick guess : are the exported normals normalized? If not, do you normalize them at some point (because I couldnt find evidence of that in your code after a quick glance)?
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    2. COYeah, the normals are exported and loaded from .obj file, I also myself checked if the normals were loading, and they were.
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    3. COthat is not my question; I'm sure you load the objects normals. What I am asking is : are they normalized? In other words: is their length 1? If that is not the case, you cannot do correct lighting.
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